I made this over the Holidays. I used #4 sheet metal screws vs. M3 machine screws. I printed the helical spur connecting shafts about 2% smaller OD for easier running, and I still needed some grease to get it working smoothly. Not a fault of the design, just the layer roughness on the gear faces from 3D printing.
Fantastic display model, thanks for designing it!
.4 nozzle, .3 layer height
100% for smaller parts for simplicity.
I needed to reprint the helical spur gear combo gears at 98% in Z as they were a tight fit in the housing (my scale factor may is slightly off on my printer)
We need a spacer on the handwheel where the motor drive goes to make this more secure, I plan on printing a simple tube to go over the shaft later. If your printer prints a bit 'fat' you need to get this dialed in as the parts need to be accurate for the model to turn freely.