Tower Crane - CyberBrick by Jorge RuiMakerWorld: Download Free 3D Models (2025)

Introduction

A crane is a type of construction equipment designed to lift and move heavy loads, materials, or objects. In real-world construction, cranes are essential for building tall structures, moving materials across sites, and handling tasks that require both strength and precision. The model you are about to assemble is inspired by these real machines, offering a similar operating principle, but in a playful, educational format. While not a scale model, this 3D-printed crane is designed as a toy, it should provide hours of fun both during assembly and in use—especially when built together as a family.

Although the project isn’t particularly complex, especially now that it’s complete, the whole documentation side took a long time and had to be done gradually. Looking back, I realize that much of that time should have been spent with my family, especially with my son, who’s still a child, needs a lot of attention, and whom I love playing with. So, I want to take this opportunity to publicly thank them for their support — not just for this project, but for many others as well. It’s thanks to them that you’re now able to enjoy this work.

Before Begin

Before you begin, it’s helpful to have a few tools at hand. You will need:

• Hexagonal Key, H1.3 and H1.5; an electric version can be a real time-saver, as there are many screws involved.
• A pair of tweezers will also be useful in several assembly steps, helping you handle small parts with greater precision.

All the materials required are listed in the Bill of Materials (BOM). Most components are available from Makerworld, but you are free to purchase them wherever you prefer. With the exception of the control modules, all parts are standard.

In addition to the items listed in the BOM, you will need:

• Super glue (Cyanoacrylate). The glue I used is this one: super glue for plastic, which is both effective and economical.
• If you can find glue applicators like these glue applicators, they will help you control the amount of glue applied and speed up drying.

As for the printed parts and their materials

These are also specified in the BOM. The prints are almost entirely in PLA, with a small amount of TPU. The recommended material for each part is clearly indicated at the top of each Build Plate in the corresponding 3mf files for Bambu Studio.

The parts are divided into two groups, so there are two 3mf files:

• TowerCrane_JorgeRui.3mf - Profile 1
• RemoteController.3mf - Profile 2

It doesn’t matter which section you choose to start. However, I recommend printing all the parts in advance, as the build plates are organized by color and printing strategy rather than by the crane modules. Of course, you are free to proceed as you prefer. All parts are clearly identified, so it won’t be difficult to print them as you go along with the assembly, in case you don’t wish to print everything at once.

Important notice

Occasionally, a screw or nut may have a manufacturing defect—this is rare, but it can happen. Signs of this include a screw that won’t tighten or a hex bit that feels too small or too large for the hex socket in the screw head. For this reason, it’s always a good idea to have a few extra screws and nuts on hand.

Assembly instruction

1. Foundation and Feet

In this first step, you will need the "Foundation" part and the "Feet" pieces, which should be printed in TPU. You may have noticed that the feet were printed one at a time—this is intentional, as it helps to prevent stringing during the printing process. If you still observe stringing or oozing, the most likely reason is that your TPU filament has absorbed too much moisture. To resolve this, follow the recommended procedures for drying your filament, which you can find here: How to Dry Filament – Bambu Lab Wiki.

What you will do in the video

This video will guide you through preparing the foundation and attaching the TPU feet, ensuring a stable base for your crane.

Special considerations

Pay close attention to the quality of your TPU prints. If you notice stringing or poor surface finish, drying your filament is essential for achieving the best results.

Materials needed

Printed parts:

• 1x Foundation (PLA)
• 4x Feet (TPU)

Hardware:

• 4x | AA044 | M2x8 BHCS Machine Screws
• 4x | AB013 | M2 Carbon Steel Square Nuts

Tools:

• Hex 1,3 bit

Step-by-step video

2. Glueing Stairs

In this step, you will be assembling and gluing the stairs onto the crane section.

This is a situation where tweezers can be particularly helpful, as well as a capillary glue applicator for precise application. The video demonstrates the assembly for one section; each section of the crane has a single area with stairs, and each of these areas requires 4 "Tower Stairs Protection" pieces.

What you will do in the video

The video will guide you through the process of positioning and gluing the stairs and their protective elements onto the crane section, ensuring everything is aligned and securely fixed.

Special considerations

Take your time to apply the glue carefully, using a capillary applicator if possible, to avoid excess glue and ensure a clean finish. Tweezers will help you handle the small parts with greater precision.

Materials needed

Printed parts:

• 1x Section with Stair (PLA)
• 4x Tower Stairs Protection (PLA)

Tools:

• Super glue (preferably with a capillary applicator)

Step-by-step video

3. Adding First Tower Section

In this step, you will attach the first tower section to the base you assembled earlier. For each additional section you wish to add, you will need the same hardware. In my build, I used a total of four sections, but you are free to add more if you wish.

The first operation is to connect the first tower section—with the stairs already glued—to the foundation and feet assembled in step 1.

What you will do in the video

The video will show you how to align and secure the first tower section to the base, ensuring a stable and precise fit. You will also see how to prepare the additional middle sections if you choose to build a taller crane.

Special considerations

Make sure all screws are tightened evenly to maintain the tower’s alignment. If you plan to add more sections, repeat the process for each one, always checking the verticality of the structure as you go.

Materials needed

Printed parts:

• 1x Section with stairs already glued
• 3x Section_middle
• 1x Foundation with feet (assembled in step 1)

Hardware:

• 8x | AA044 | M2x8 BHCS Machine Screws
• 8x | AB013 | M2 Carbon Steel Square Nuts

Tools:

• Hex 1,3 bit
• Tweezers

Step-by-step video

4. Second Vertical Section and More

This process is identical to the previous step. You will be stacking the next tower section onto the structure, following the more or lesse the same assembly method.

What you will do in the video

The video will demonstrate how to add the next vertical sections, ensuring everything is properly aligned and securely fastened.

Special considerations

Make sure all screws are tightened securely. Occasionally, a screw or nut may have a manufacturing defect—this is rare, but it can happen. Signs of this include a screw that won’t tighten or a hex bit that feels too small or too large for the hex socket in the screw head. For this reason, it’s always a good idea to have a few extra screws and nuts on hand.

Materials needed

Printed parts:

• 1x Tower interface
• 1x Section with stairs (from step two)
• 3x Section_middle

Hardware:

• 8x | AA044 | M2x8 BHCS Machine Screws
• 8x | AB013 | M2 Carbon Steel Square Nuts

Tools:

• Hex 1.3 bit
• Tweezers

Step-by-step video

5. Glue Tie Rods

After assembling the first and the second sections, it is time to glue the tie rods to the base of the crane. The printed part you will need is called "Tie Rod." By this point, you should already have the first, second, and third parts of the crane ready.

What you will do in the video

The video will show you how to position and glue the tie rods securely to the base, ensuring proper alignment and stability for the structure.

Special considerations

Take care to apply the glue precisely, using a capillary applicator if possible, to avoid excess glue and ensure a clean, strong bond.

Materials needed

Printed parts:

• 4x Tie Rod (PLA)

Tools:

• Super glue (preferably with a capillary applicator)
• Tweezers

Step-by-step video

6. Counterweights

In this step, you will prepare and install the counterweights for your crane. These are important for ensuring the stability of the structure during operation.

What you will do in the video

The video will guide you through the process of inserting magnets into the counterweight parts during printing, as well as attaching the finished counterweights to the base of the crane. Special attention is given to the correct orientation of the magnets, as the counterweights must attract each other to function properly.

Special considerations

Depending on your material calibration, you may need a small amount of glue to ensure the magnets are securely fixed inside the counterweights. Always check the orientation of the magnets before inserting them—counterweights should attract each other, not repel. You can use a piece of paper to help identify the magnetic orientation and avoid mistakes. In practice, the orientation should remain consistent for all magnets. If in doubt, print just the first batch and test before proceeding with the rest (see the video for more details).

During the printing process, your printer will automatically pause twice to allow you to insert the magnets. After the second pause and magnet insertion, the print will continue until finished. These parts are printed with 100% infill to maximize their mass.

In the first version, I used spent AAA batteries inside the counterweights to add weight; if you are interested in this variation, I can provide the alternative model.

You will need to print as many "Counterweight" pieces as you find necessary, and also 4 "Fixture_magnet" parts, which will allow the counterweights to attach securely to the base of the crane (assembled in steps 1, 3, and 5). In this case, I assume that you will use 4 counterweights on each side, making a total of 16.

The number of magnets you use depends on how many counterweights you want to install. I suggest starting with 4 on each side, but you can use more or fewer as needed. The more counterweights you add, the more stable the crane will be; however, 4 per side already provides very good stability.

Materials needed

Printed parts:

• Counterweight (PLA) – as many as needed
• 4x Fixture_magnet (PLA)

Hardware:

• 36x | CA009 | D10x3 Round Magnet

Tools:

• Super glue (preferably with a capillary applicator) (if needed)

Step-by-step video

7. Glue the "Glass" Panels on the Cabin Sides

In this step, you will glue the decorative "glass" panels onto the sides of the cabin, starting the assembly of what will soon become the crane’s cabin. This operation does not depend on previous steps, so you can complete it at any time once the necessary parts are printed.

For these components, a material with a metallic grey tone—such as standard PLA in Silver—works particularly well and enhances the overall appearance of the cabin.

What you will do in the video

The video will show you how to position and glue each "glass" panel onto the corresponding side of the cabin, ensuring a neat and precise fit.

Special considerations

Before gluing, take a moment to remove any burrs or imperfections from the screw or nut housings on the printed parts. This will help the panels fit better and improve the final appearance.

Materials needed

Printed parts:

• 1x Cabin_door
• 1x Cabin
• 1x Cabin_window_front
• 1x Cabin_window_right
• 1x Cabin_window_left

Tools:

• Super glue (preferably with a capillary applicator)
• Tweezers (optional, for precise placement)

Step-by-step video

8. Installing the MainBoard

This step brings you closer to completing the control cabin. Now, you will install the MainBoard, which will later be used to connect the motors and LEDs.

What you will do in the video

The video will guide you through the process of positioning and securing the MainBoard inside the cabin, using the dedicated fixture.

Special considerations

Ensure the MainBoard is properly aligned and securely fastened, as this will make connecting the electronics easier in the following steps.

Materials needed

Printed parts:

• 1x Control_board_fixture

Hardware:

• 1x | XA004 | Remote Control Receiver Board
• 2x | AA044 | M2x8 BHCS Machine Screws

Tools:

• Hex 1.3 bit

Step-by-step video

9. Assembling Cabin and Turn-table

In this step, you will assemble the cabin with the turn-table mechanism, a key part of the crane’s rotation system.

What you will do in the video

The video will guide you through the first part of the turn-table assembly, showing the correct sequence for fitting each component. Tweezers will be helpful for some operations, and a small amount of super glue is recommended to secure the square nuts in the "Turntable Frame," especially those located near the lower edge of the part.

Special considerations

If you have difficulty fitting the bearing, check the "Bearing Support" for any burrs and remove them carefully. Be patient and avoid applying force to the inner ring of the bearing. For the gears, inspect the teeth to ensure they are uniform, free of burrs, and fully formed.

Important remark: Some of these parts are on a build plate marked for use with a 0.2 mm nozzle. This is recommended because these are small parts with intricate details. Although the crane has been tested with parts printed using a 0.4 mm nozzle by several people, you will likely achieve better results with a 0.2 mm nozzle. However, this is not mandatory.

Near the end of the assembly (around minute 10 in the video), you will see a test of the full range of movement, repeated until the mechanism operates smoothly without any blockage. If available, you can use a PTFE-based lubricant (usually in spray form) on the gear contact areas. Do not use other lubricants, as they may degrade PLA.

Materials needed

Printed parts:

• 1x Turntable
• 1x Bearing Support
• 1x Turntable Frame
• 1x Axis fixation
• 1x Pinion M0.8 Z15

Hardware:

• 8x | AA044 | M2x8 BHCS Machine Screws
• 12x | AB013 | M2 Carbon Steel Square Nuts
• 1x | LA002 | N20 Reduction Gear Motor 150rpm
• 1x | EA005 | 6704 Steel Deep Groove Ball Bearing

Tools:

• Hex 1.3 bit
• Tweezers
• Super glue (preferably with a capillary applicator)
  • PTFE-based lubricant (optional, for gear contact areas)

Step-by-step video

10. Safety Railing

In this step, you will prepare the safety railing elements for the turn-table. Although the video demonstrates gluing these parts to the turn-table at this stage, it is recommended that you wait before attaching them. Gluing the safety railing now may make it more difficult to connect the wiring to the control board in later steps, so don't do it now!

What you will do in the video

The video shows how to position and glue the safety railing components. However, for ease of assembly later, it’s best to only fit them temporarily, you can glue the top railing to the lower part if you feel it is necessary.

Special considerations

If you decide to glue the "Safety railing_Top" to the "Safety railing" now, do so carefully to ensure a clean and secure fit. Otherwise, keep both parts ready for final assembly after the electronic connections are complete.

Materials needed

Printed parts:

• 1x Safety railing
• 1x Safety railing_Top

Tools:

• Super glue (preferably with a capillary applicator) (if you choose to glue the two railing parts together)

Step-by-step video

11. Tower and Cabin Assembly

In this step, you will join the tower assembly to the turn-table and cabin assembly, bringing together two main structural elements of your crane and prepare for the Jib

What you will do in the video

The video will guide you through aligning and securing the tower to the turn-table/cabin interface, ensuring a stable and precise fit. You will also check the overall stability of the structure and test the movement of the turn-table once more to confirm smooth operation.

Special considerations

Take your time to ensure the structure is stable before tightening all screws. After assembly, again, rotate the turn-table to verify that it moves freely and without obstruction.

Materials needed

Printed parts:

• Turn-table assembly (prepared in previous steps)
• Tower assembly (prepared in previous steps)

Hardware:

• 8x | AA044 | M2x8 BHCS Machine Screws

Tools:

• Hex 1.3 bit

Step-by-step video

12. Jib Assembly

In this step, you will assemble the jib, which is the horizontal arm of the crane. This assembly consists of two sections: one at the tip, which allows the trolley to reach its maximum position, and another closer to the cabin. In real cranes, it is possible to add more sections to extend the jib, but for this model, two sections are used. In the future, additional sections may be added if desired.

What you will do in the video

The video will guide you through the assembly sequence for the jib, including the installation of the pulley and the correct placement of all structural parts. Follow the video closely for best results.

Special considerations

During assembly, you may encounter tight fits, especially where dowel pins are inserted. If you have difficulty inserting a pin, you can use an M2 screw to gently widen the hole—just make sure the screw passes through the entire length of the hole before inserting the pin.
When removing the "Catwalk"-type structure after printing, be especially careful as it is fragile. Allow it to cool thoroughly before attempting removal.
As with the turn-table, test the pulley to ensure it rotates freely. If the movement is not smooth, slightly widen the hole or remove any burrs.
All models shown in the video were printed with a 0.4 mm nozzle, but the pulley and its support would benefit from being printed with a 0.2 mm nozzle for better detail.
Apply a small amount of glue to the central sections that join the structure, as demonstrated in the video.

Materials needed

Printed parts:

• 1x Horizontal Structure_Tip_R
• 1x Horizontal Structure_Tip_L
• 1x Horizontal Structure_Tip
• 1x Horizontal_section1_End
• 1x Horizontal Structure_End_L
• 1x Horizontal Structure_End_R
• 1x Horizontal Structure_End
• 1x Pulley Support
• 1x Pulley
• 2x Catwalk

Hardware:

• 20x | AA043 | M2x6 BHCS Machine Screws
• 20x | AB013 | M2 Carbon Steel Square Nuts
• 2x | DA004 | 2x13 Brass Dowel Pin
• 1x | DA007 | 2x6mm Stainless Steel Dowel Pin
• 1x | AA043 | M2x6 BHCS Machine Screw (for pulley)
• 1x | AB013 | M2 Carbon Steel Square Nut (for pulley)

Tools:

• Hex 1.3 bit
• Super glue (preferably with a capillary applicator)
• Tweezers (optional, for handling small parts)

Step-by-step video

13. Jib Center

The jib center is one of the most important components of the crane, as it contains the cable traction system. This mechanism is not a traditional tensioner—although that solution was tested, it did not work well with nylon thread due to technical challenges. The current system, which you will assemble in this step, is more effective and reliable. Throughout the end of this project, you may need to mount and dismount this traction system several times, and that's by design.

What you will do in the video

In this video, you will assemble the central section of the jib, install the traction system, and fit the necessary hardware and printed parts. The video will guide you through the correct sequence, including tips for handling the cable and fitting the motor. You will also see how to remove and reinstall the motor and traction system as needed during the build.

Special considerations

Among the printed parts, the TPU Drag Wheel must be printed in TPU. Although it is a small part, it is not recommended to print it with a 0.2mm nozzle. For the other parts, if you have a 0.2mm nozzle, you can use it for improved detail, but all parts shown in the video were printed with a 0.4mm nozzle and are fully functional. After printing, check that the smaller parts are free from burrs or imperfections that could affect the mechanism’s performance.

Materials needed

Printed parts:

• 1x Jib (PLA)
• 1x Chassis for traction (PLA)
• 1x Pinion_for_trolley (PLA)
• 1x Drag wheel (TPU)
• 1x Pinion2 for trolley (PLA)
• 1x Hub for trolley (PLA)

Hardware:

• 1x | DA001 | 2x18mm Stainless Steel Dowel Pin
• 1x | BC006 | 0.8x5x3mm 120 degree Torsion Spring
• 1x | LA008 | N20 Reduction Gear Motor 25rpm
  

Step-by-step video

14. Apex and LED's

The apex is the highest point of the crane and serves as the main anchor for the cables and the mounting location for the LED lighting system. In this step, you will assemble the apex, install the cable anchors and covers, and add the LED modules and light diffusers. This stage involves careful handling of several small printed parts and delicate cables. Once the electrification and pin installation are complete, the apex will be fixed to the jib that was assembled in the previous step.

What you will do in the video

In the video, you will see how to prepare and assemble all the printed parts for the apex, including the cable anchors, covers, and light diffusers. The video demonstrates how to route and secure the cables, install the LED modules, and use fine-tipped pliers for inserting dowel pins. You will also see how to glue the cable covers and light diffusers in place, and how to connect the LED adapter board and RGBW LEDs. The process of fixing the apex to the jib is also shown.

Special considerations

This step uses many printed parts, so it is recommended to prepare them in advance. Some of these parts will be introduced as the video progresses. Handle the cables with care, as they are very thin and can be easily damaged. Fine-tipped pliers can be helpful for inserting dowel pins, especially if the holes are tight. If necessary, you can widen the holes with an M2 screw, as done in previous steps. In the video, none of the parts were pre-drilled, so pliers were used to insert the pins. For cable routing, tweezers were used—ideally, you could use one of the many 3D-printed plastic tweezers available. The cable covers and the light diffusers should be fixed in place with glue, preferably applied with a capillary applicator for precision.

Materials needed

Printed parts:

• 1x Apex (PLA)
• 1x Cable cover (PLA)
• 1x Cable cover2 (PLA)
• 1x Cable cover3 (PLA)
• 1x Cable anchor1 (PLA)
• 1x Cable anchor2 (PLA)
• 1x Cable anchor4 (PLA)
• 1x Jib center (completed in the previous step)
• 3x Light diffuser (PLA, preferably in a translucent or white material for best effect)

Hardware:

• 2x | DA002 | 2x25mm Stainless Steel Dowel Pin
• 3x | AB013 | M2 Carbon Steel Square Nut
• 3x | AA044 | M2x8 BHCS Machine Screw
• 1x | XA006 | WS2812 LED Light Adapter Board with 3Pin SH1.0 Connector
• 3x | KB003 | WS2812 RGBW LED with 0.8mm IDC

Tools:

• Fine-tipped pliers
• Tweezers (preferably plastic, 3D-printed if available)
• Super glue (preferably with a capillary applicator)

Step-by-step video

15. Counter Jib

The counter jib is a straightforward but essential part of the crane assembly, providing balance and support for the main jib. In this step, you will attach the counter jib cables and anchors to the jib center with apex, using dowel pins and glue to secure the cables at their anchor points.

What you will do in the video

In the video, you will see how to position and secure the counter jib cables and anchors. The process includes inserting the dowel pins and gluing the cables to the anchor points. The video also demonstrates the technique for handling the dowel pins, as described in previous steps, and shows the correct placement of each component.

Special considerations

Although this step is simple, working with dowel pins may require the same approach used in earlier steps. If the holes are tight, you can widen them slightly with an M2 screw. Use a small amount of glue to secure the cables to the anchor points, ensuring a firm hold.

Pay special attention to the alignment of the cables—make sure they remain straight and do not appear bent or flexed, as this will improve both the appearance and function of the assembly.

Materials needed

Printed parts:

• 1x Jib Center with Apex (assembled in previous steps)
• 2x Cable1 (PLA)
• 2x Cable anchor3 (PLA)

Hardware:

• 2x | DA007 | 2x6mm Stainless Steel Dowel Pin

Tools:

• Fine-tipped pliers (if needed for dowel pins)
• Super glue (preferably with a capillary applicator)

Step-by-step video

16. Tensioning Cables

In this step, you will install and tension the main cables that support the jib and counter-jib. This is a crucial phase for the structural stability and appearance of your crane. You will be working with larger assemblies, so make sure you have a spacious work area to move and position the parts comfortably.

What you will do in the video

The video begins by showing how to attach the cable anchor points to the jib. Next, you will see how to join the jib to the center jib using dowel pins. The main traction cables (Cable2 and Cable3) are then installed—these are functional elements that will hold the jib in place. The video demonstrates how to secure the anchor points and how to adjust the cables using the rack mechanism, ensuring the jib remains horizontal or very slightly elevated. You will also see tips for achieving proper cable alignment and tension.

Special considerations

At this stage, you will be handling relatively large parts, so a larger workspace is recommended. Take your time to ensure the main traction cables are properly tensioned. The jib should be horizontal or very slightly raised—never pointing downward, even slightly. As with the counter-jib cables, make sure none of the cables are bent or flexed; if a cable is too slack or flexed, all the load will be concentrated on a single cable, which is not ideal. If necessary, you can trim a cable slightly or reprint it at a slightly reduced length, but this should rarely be needed if you follow the instructions carefully. Always check that the anchor points are firmly fixed. Adjust the cables as needed until you are satisfied with the result.

Materials needed

Printed parts:

• Complete assembly of the jib, counter-jib, and jib center from previous steps
• 2x Cable anchor3 (PLA)
• 2x Cable3 (PLA)
• 2x Cable2 (PLA)
• 2x Fixture_cable (PLA)

Hardware:

• 2x | DA004 | 2x13 Brass Dowel Pin
• 2x | DA007 | 2x6mm Stainless Steel Dowel Pin

Tools:

• Fine-tipped pliers (for dowel pins)
• Super glue (preferably with a capillary applicator)

Step-by-step video

17. Power On/Off Switch Box and Protection Rails

In this step, you will install the main power switch for the crane and fit the protection rails to the upper structure. The power switch box is mounted on the counter-jib, and the protection rails are positioned around the apex and counter-jib areas to enhance both safety and realism.

What you will do in the video

The video demonstrates how to assemble the ON/OFF switch case and lid, install the power switch board, and mount the completed box onto the counter-jib. You will also see where to position the protection rails on the apex and counter-jib. The video shows how these parts are glued to the structure, but, as with the cabin safety rails, it is recommended to wait before gluing—especially the rail on the counter-jib next to the ON/OFF switch box—until all cables are in place.

Special considerations

Take care when handling the small hardware and printed parts for the switch box. Only glue the protection rails once you are certain all cables are correctly routed and installed, to avoid having to remove them later. The protection rails and switch box should fit snugly, but a small amount of super glue (preferably with a capillary applicator) can be used for a secure hold once final placement is confirmed.

Materials needed

Printed parts:

• 1x ON_OFF Switch case (PLA)
• 1x ON_OFF Switch case lid (PLA)
• 1x Safety railing Counter-L (PLA)
• 1x Safety railing Counter-R (PLA)
• 2x Safety railing Apex (PLA)
• Complete upper crane assembly from previous steps

Hardware:

• 1x | XA007 | Power Switch Board with 2Pin XH2.54 Connector
• 1x | AB013 | M2 Carbon Steel Square Nut
• 1x | AA163 | M2x5 Machine Screw

Tools:

• Hex 1.3 bit (for M2 screws)
• Super glue (preferably with a capillary applicator)
• Tweezers (optional, for small parts)

Step-by-step video

18. Trolley Assembly – 1st Part

Unlike previous steps, this section includes two videos. The assembly of the hook and the installation of the micro-bearings have been separated into individual videos for greater clarity. In this stage. So, you will assemble the trolley mechanism, which is responsible for moving the hook and lifting loads. This assembly involves several printed parts, hardware, and the installation of the servo motor and nylon cable. The trolley is a key moving part of the crane, and careful assembly will ensure smooth operation.

What you will do in the video

The video provides a step-by-step guide to assembling the trolley. You will see how to insert the dowel pins, which act as axles for the micro-bearings (next step), and how to fix the servo motor in place. The video also demonstrates how to thread and secure the nylon cord, which will serve as the lifting cable for the crane’s hook. You will learn how to measure and cut the correct length of cord, tie simple knots to prevent it from slipping out of the pulley. Special attention is given to the correct placement of the pulley on the motor shaft to avoid contact with the trolley’s side walls, which could hinder movement.

Special considerations

For this step, you will need a small amount of tape, scissors, and fine-tipped pliers to help with the dowel pins if necessary.

When measuring the nylon cord, consider the total height of your crane: each vertical section is about 92mm, and with four sections plus the base and cabin, you will need approximately 400mm. To allow for knots and some extra winding, use about 600mm of cord, as shown in the video. Make sure the knots are secure, and use a drop of glue if needed to prevent the cord from slipping. Take care to ensure the pulley is properly seated on the motor shaft; if it is not, it may rub against the trolley’s side walls, especially after the cord is installed. This can impede the motor’s movement, particularly if the knot touches the side wall. Note that, unlike real cranes, the nylon cord may not wind perfectly evenly, which can cause a slight jerk when lowering loads. This is normal for this type of system and is due to the properties of nylon cord compared to steel cable.

Materials needed

Printed parts:

• 1x Hook (PLA)
• 1x Sheave front (PLA)
• 1x Sheave back (PLA)
• 2x Lateral Trolley (PLA)
• 1x Chassis Trolley (PLA)
• 1x Polley Trolley (PLA)
• Complete upper crane structure from previous steps

Hardware:

• 2x | AA044 | M2x8 BHCS Machine Screws
• 6x | AB013 | M2 Carbon Steel Square Nut
• 4x | AA163 | M2x5 Machine Screw
• 6x | DA004 | 2x13 Brass Dowel Pin
• 1x | PG002 | 360° 9g Servo Motor with Clutch Protection
• 1x | MF001 | 0.6mm Black Nylon Cord 5m
• 4x | EA003 |MR52 Steel Deep Groove Ball Bearings
• 2x | CA009 |D10x3 Round Magnet (2nd vídeo)

Tools:

• Fine-tipped pliers (for dowel pins)
• Scissors (for cutting the cord)
• Tape (to help with cable management)
• Super glue (preferably with a capillary applicator, for securing knots if needed)

Step-by-step video (1st Part)

Step-by-step video (2nd Part)

19. Trolley Traction Cable

In this step, you will install the traction cable that runs from the tip of the jib to the trolley motor. This cable is essential for the movement of the trolley along the jib and must be routed and tensioned carefully for smooth operation.

What you will do in the video

The video demonstrates how to estimate and cut the correct length of nylon cord—approximately 105 cm (3.28 feet)—allowing for a little extra to make assembling process easier. You will see how to route the cable from the tip of the jib, passing it through the pulley, then looping it around the traction system at the center jib. The cable then passes underneath the jib, following the V-shaped guides, and finally enters the trolley.

The video shows how to secure the cable first with a knot and then with a screw for a permanent fix. The trolley should be kept off the jib during this process. Once the cable is routed and initially secured, you will place the trolley back onto the jib guides, check that the cable is not twisted or caught, and pull the loose end to achieve the correct tension (you don't need much). Finally, you will fix the cable in place with a screw and trim any excess with scissors.

Special considerations

This process can be a bit time-consuming, so take your time to ensure the cable is routed correctly and tensioned properly. Make sure the cable passes through all the V-shaped guides along the jib and is not twisted or snagged at any point. Proper tension is important for smooth trolley movement. Use a knot and a screw to secure the cable, as shown in the video, and trim any excess cord once the cable is fixed.

Materials needed

Printed parts:

• Fully assembled jib from previous steps

Hardware:

• 2x | AA163 | M2x5 Machine Screw
• 1x | MF001 | 0.6mm Black Nylon Cord 5m

Tools:

• Scissors (for cutting the cord)
• Hex 1.3 bit (for M2 screws)

Step-by-step video

20. Jib Cable Guide

In this step, you will install the cable guides along the jib, ensuring the servo extension cable is properly routed and supported for smooth trolley movement. This process involves gluing, pin insertion, and careful cable management to guarantee reliable operation.

What you will do in the video

The video demonstrates how to glue the DuPont terminal (male end) of the servo motor extension cable to one of the cable support bridges. Although the gluing process is not shown in the video due to the lack of a dedicated extension cable at the time, you should glue the male end as demonstrated in the simulation. The video then shows how to insert the dowel pins into the cable guides, using the same technique as in previous steps—fine-tipped pliers and, if necessary, widening the holes with an M2 screw. You will see how to route the cable through the guides, ensuring the cable is distributed evenly between each bridge. Each cable guide is then flexed slightly and clipped onto the jib. The cable should reach the inside of the cabin, where it will connect to the control board. The video concludes with tips for adjusting the position of the pins and simulating full-range trolley movement to help the cable adapt and flex naturally.

Special considerations

If your extension cable is particularly rigid, as shown in the video, it may make trolley movement less smooth. This should not be an issue with a dedicated, more flexible cable. Take care to distribute the cable evenly between each guide, and ensure all parts move freely after assembly. Use fine-tipped pliers for pin insertion, and widen holes with an M2 screw if needed. After assembly, simulate several full-range trolley movements to help the cable adapt to the flexing required during operation.

Materials needed

Printed parts:

• 3x Cable_trolley (PLA)

Hardware:

• 1x | B-XC011| Servo Extension Cable 3Pin 200m
• 18x | DA007 | 2x6mm Stainless Steel Dowel Pin

Tools:

• Fine-tipped pliers (for dowel pins)
• Super glue (preferably with a capillary applicator, for gluing the terminal)
• Hex 1.3 bit (for M2 screws, if needed)
• Tweezers (optional)

Step-by-step video

21. Attach Jib to Tower

In this step, you will join the fully assembled jib to the completed tower and cabin structure. This is a key moment in the assembly, as it brings together the main horizontal and vertical elements of your crane. Make sure your workspace is clear and spacious, as you will need room to maneuver the large assemblies.

What you will do in the video

The video demonstrates how to align and attach the jib to the tower using screws and square nuts. You will see how to temporarily remove the motor and traction system from the top of the jib to make the process easier. The video also shows how to use a small amount of glue to hold the square nuts in place inside the cabin, and how tape can help keep the nylon trolley cable in position during assembly. You will learn how to carefully align the jib with the tower, insert the screws, and avoid dislodging the glued nuts. The final step in the video is connecting the power switch cable to the control board—if you have already done this or never removed it, you can skip this part.

Special considerations

Clear your workspace before starting, as you will need plenty of space to handle the large parts. If your workspace is limited, some steps may be less visible in the video, but the process is straightforward and all essential details are covered. Use a small amount of glue to secure the square nuts inside the cabin before assembly. Tape can be helpful to keep the nylon cable in place. Do not overtighten the screws, as this could dislodge the nuts. Follow the video instructions carefully for best results.

Materials needed

Printed parts:

• Complete jib assembly (from previous steps)
• Complete tower with cabin (from earlier steps)

Hardware:

• 4x | AA044 | M2x8 BHCS Machine Screws
• 4x | AB013 | M2 Carbon Steel Square Nut

Tools:

• Hex 1.3 bit (for M2 screws)
• Super glue (preferably with a capillary applicator, for securing nuts)
• Tape (to help hold the nylon cable in place)
  • Tweezers (optional)

Step-by-step video

22. Cables and Connections

In this step, you will route and connect the main power and control cables, install the battery Li-ion on the counterweights of the counter-jib. This stage is essential for powering up your crane and ensuring all electronic components are correctly connected. Take your time and work in a calm environment, as careful handling of the cables is crucial for reliable operation.

What you will do in the video

The video begins by showing how to route the battery cable along the counter-jib to the ON/OFF switch. You will see how to install the Li-ion battery and, for extra weight, how to add two AAA batteries inside one of the counterweights.

The video demonstrates a sequence for cable routing and highlights an alternative, maybe better, method discovered later, which may make the process easier.

Special considerations

Fully charge the Li-ion battery before starting this step. Use tweezers to help with cable routing, taking care not to damage the cables. Only glue the protection rails after all cables are in place—especially around the cabin, as you may need to access the control board again. If you glued the rails prematurely, you may find cable installation more difficult (like me). Work patiently and without time pressure; if you feel tired or frustrated, take a break and continue later. This project should be enjoyable, not stressful…

It is very important to connect each cable to the correct port as shown in the video. The programming is set for specific ports. The servo motor cables for the hook should be connected to the pins on the side of the cabin door. Switch the power to Off before connecting the battery. If the battery is charged, the LEDs will flash when you turn the crane on. If not, check all cable connections, especially the LED cable.

Materials needed

Printed parts:

• 2x Counterweight for counter-jib (PLA)
• 2x Counterweight lid (PLA)

Hardware:

• 1x | PC003 | 14500 7.4V 800mAh Li-ion Battery

Tools:

• Tweezers (essential for cable routing)
• Super glue (preferably with a capillary applicator, for fixing protection rails)
• Scissors (optional, for cable management)

Step-by-step video

23. Remote Controller Assembly

This final step covers the assembly and wiring of the remote controller, which will allow you to operate your crane. All the printed components for the remote are included in the supplementary file "Remote controller_Jorge Rui.3mf". If any parts require two colors, you can achieve this either manually or with an AMS system—only two layers require color, so even manual changes are straightforward. Of course, you can print all parts in a single color if you prefer.

What you will do in the video

The video demonstrates how to assemble the remote controller, starting with the placement of the electronic components—joysticks, button, battery case, and transmitter board—into the controller housing. You will see how to orient and connect each component, following the wiring as shown. The video also covers the insertion of M2 nuts during the print pause for the "Bottom" part, and how to use metric screws as self-tapping fasteners directly into the plastic. Special attention is given to cable management, especially for the joystick that controls the trolley along the jib. In the video, the cable for this joystick was slightly short and had to be routed through the battery compartment, which is acceptable. In future updates, a longer cable reference will be provided, and a dedicated channel at the top of the controller is already designed for this purpose.

Special considerations

During printing, the "Bottom" part will pause to allow you to insert M2 nuts in the indicated locations—refer to the figure for correct placement, then resume printing. Handle all cables with care to avoid damage, especially when positioning the control module, which will protrude slightly from the housing. Placing a soft cloth under the controller during assembly can help protect the components. The right-side half-moon cutout is designed to provide a comfortable grip and support, eliminating the need for supports across the entire bottom surface. Although metric screws are used, they are driven directly into the plastic as self-tapping screws to reduce hardware variety. Some parts will need to be glued in place during final assembly; as you may have noticed, this project favors glue over snap-fits for reliability and ease of assembly where disassembly is not required.

Materials needed

Printed parts:

• All components from the "Remote controller_Jorge Rui.3mf" file (print all parts; color changes are optional)

Hardware:

• 14x | AA167 | M2.5x5 Machine Screw
• 5x | AA163 | M2x5 Machine Screw
• 3x | XA009 | Single-Axis Channel Joystick with 3Pin SH1.0 Connector
• 1x | XA008 | Button Board with 2Pin SH1.0 Connector
• 1x | XA012 | 3x1.5V AAA Battery Case with XH2.54 Connector
• 1x | XA005 | Remote Control Transmitter Board

Tools:

• Hex 1.5 bit (for M2.5 screws)
• Hex 1.3 bit (for M2 screws)
• Super glue (preferably with a capillary applicator)
• Tweezers (optional, for cable management)
• Soft cloth (to protect components during assembly)

Step-by-step video

Final Notes

Congratulations on reaching the end of this project! Completing a 3D-printed crane of this complexity is no small feat, and you should feel genuinely proud of your achievement. This build is not for everyone—it requires patience, attention to detail, and a real passion for making. I hope the process has been as rewarding for you as it was for me to design and share.

Don’t forget to add some stickers to both the crane and the remote controller. It’s a simple touch, but it will give your project a much more professional and finished look.

I would love to see your crane in action! If you can, please share your final result. It’s always inspiring to see how each maker brings their own personality to the build.

Thank you for following along with this project. I truly hope you enjoyed it. More projects are already in development, so if you’d like to keep up with what’s next, visit my blog at https://designrepcom.com/.

You can even subscribe for free updates—I’d be delighted to have you as a follower, both here on Makerworld and on the blog.

Take care, and happy making!

Change Log

19/05/2025 - Service pack 1: A cutout has been added to the enclosure to allow direct access to the USB-C cable, which is required for firmware updates. This means there's no longer a need to disconnect any cables in order to pull out the drawer that contains the module.
This service pack is available as an extra profile, but it is also already included in the "TowerCrane" print profile.