Marblevator, Take the Stairs!

Parts.

I acquired the following parts:

• One N20 6VDC 60RPM gear motor.
• One 4AAA cell switched battery pack.

• 11mm nylon spheres.

I 3D printed the following parts at .1mm layer height, 20% infill and no supports:

• One "Base.stl".
• Five "Bolt (M8 by 8mm).stl".
• One "Drive Pin.stl".
• One "Motor Mount.stl".
• One "Stairs Down.stl".

• Two “Stairs Down 2 and 3.stl”.
• One "Stairs Up.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.

Assembly.

Model assembly is presented in the attached video.

With that, that is how I 3D printed and assembled "Marblevator, Take the Stairs!".

I hope you enjoyed it!