Marblevator, Halloween 2025.

Marblevator, Halloween 2025 was created by my wife. Not being familiar with Autodesk Fusion 360, 3D printing, etc., she then asked if I would design, 3D print and assemble the model for the grandkids, so I did and here it is!

As usual I probably forgot a file or two or who knows what else, so if you have any questions, please do not hesitate to ask as I do make plenty of mistakes.

Designed using Autodesk Fusion 360, sliced using Ultimaker Cura 4.12.1, and 3D printed in PLA on Ultimaker S5s.

1. Soldering iron and solder.
2. Thick cyanoacrylate glue.
3. 4.5mm hex wrench.

I acquired the following parts:

1. One N20 30RPM 6VDC Gear Motor.
2. One Two AA Battery Box with switch and wires.
3. Eight 3.1MM diameter by 1MM thick neodymium magnets.
4. Two AA Batteries.
5. One 10MM nylon sphere.

I 3D printed the following parts at .15mm layer height, 20% infill and no supports:

1. One "Arm Left.stl".
2. One "Arm Right.stl".
3. One "Axle Hands.stl".
4. Three "Axle.stl".
5. Two "Base Tower.stl".
6. One "Base.stl".
7. Four "Bolt (M8 by 1.25 by 8mm).stl".
8. Four "Bolt (M8 by 1.25 by 12mm).stl".
9. One "Cam.stl".
10. One "Clamp Gate.stl".
11. One "Clamp Hand.stl".
12. One "Clamp Track End.stl
13. One "Clamp Track Start.stl".
14. One "Gate.stl".
15. One "Hands.stl".
16. One "Jack O'Lantern.3mf".
17. Two "Leg Lower".
18. One "Leg Mount.stl".
19. Tow "Leg Upper.stl".
20. One "Motor Mount.stl".
21. One "Stem.stl".
22. One "Torso.stl".
23. One "Yoke Guide.stl".
24. One "Yoke Pin.stl".
25. One "Yoke.stl".

This mechanism is a high precision print and assembly using at times very small precision 3D printed parts in confined spaces with highly precise alignment. Prior to assembly, I test fitted and trimmed, filed, drilled, sanded, etc. all parts as necessary for smooth movement of moving surfaces, and tight fit for non moving surfaces. Depending on your slicer, printer, printer settings and the colors you chose, more or less trimming, filing, drilling and/or sanding may be required to successfully recreate this model. I carefully filed all edges that contacted the build plate to make absolutely certain that all build plate "ooze" is removed and that all edges are smooth using small jewelers files and plenty of patience.

This mechanism also uses threaded assembly, so I used a tap and die set (M8 by 1.25) as required for thread cleaning.

To assemble the track tower, I performed the following steps:

1. Threaded two "Base Tower.stl" together then threaded them into "Base.stl".
2. Attached "Gate.stl" to "Clamp Gate.stl" using one "Axle.stl".
3. Slid the gate assembly onto the base tower such that the lower end of the gate clamp was 88mm below the top of the tower with the gate aligned as shown, then secured in place with one "Bolt (M8 by 1.25 by 12mm).stl".
4. Slid "Clamp Track End.stl" onto the base tower such that the lower end of the track end clamp was 70mm below the top of the tower and aligned as shown, then secured in place with one "Bolt (M8 by 1.25 by 12mm).stl".
5. Slid "Clamp Track Start.stl" onto the base tower such that the lower end of the track start clamp was 45mm below the top of the tower and aligned as shown, then secured in place with one "Bolt (M8 by 1.25 by 12mm).stl".
6. Slid "Clamp Hand.stl" onto the base tower such that the lower end of the hand clamp was 25mm below the top of the tower and aligned as shown, then secured in place with one "Bolt (M8 by 1.25 by 12mm).stl".

To assemble the torso, I performed the following steps:

1. Pressed 4 neodymium magnets into the magnet pocket in "Hands.stl".
2. Pressed 2 neodymium magnets into the magnet pocket in "Arm Right.stl" matching the polarity of the hand magnets.
3. Pressed "Axle Hands.stl" into the axle pocket in the right arm assembly.
4. Pressed the right arm assembly into the right arm slot in "Torso.stl". Note the right arm slot is the slot opposite the rectangular hole in the torso fringe.
5. Slid the hands assembly onto the hands axle.
6. Pressed "Arm Left.stl" into the left arm slot in the torso and onto the hands axle then adjusted the assembly such that the hand rotated down with ease then returned to the rest position.
7. Glued "Stem.stl" onto "Jack O' Lantern.3mf" then glued the assembly onto the torso assembly.

To assemble the lift mechanism, I performed the following steps:

1. Glued "Leg Mount.stl" and "Yoke.stl" onto each end of "Yoke Pin.stl" making certain the yoke pin was perpendicular to both the yoke and leg mount.
2. Snapped one "Leg Upper.stl" to one "Leg Lower.stl" making certain the leg sections rotated with ease.
3. Snapped the leg assembly onto the leg mount making certain the leg assembly rotated with ease.
4. Repeated the previous two steps for the remaining leg assembly.
5. Soldered the battery pack wires to the gear motor.
6. Pressed the gear motor into "Motor Mount.stl".
7. Pressed "Cam.stl" onto the gear motor shaft.
8. Slipped the cam into "Yoke Guide.stl" then secured the motor, motor mount and cam in place with two "Bolt (M8 by 1.25 by 8mm).stl".
9. Slid the yoke assembly into the yoke guide assembly then slightly flexed the yoke slot to engage the cam pin.

For final assembly, I performed the following steps:

1. Attached the lift assembly to the base assembly using two "Bolt (M8 by 1.25 by 8mm).stl".
2. Attached the lower legs to the base assembly using two "Axle.stl" making certain the legs rotated with ease.
3. Pressed the torso assembly onto the leg mount assembly.

After assembly, I carefully adjusted the locations of the gate, track end, track start and hand clamps such that the mechanism reliably picked up the nylon sphere from the end of the track and dropped it onto the start of the track.

And that is how I 3D printed and assembled "Marblevator, Halloween 2025".

We hope you enjoyed it!