This is a fully 3D printed clock
See it here:
Apart from the electronics and stepper motor, everything is 3D printed
All gears, shafts, screws, nuts, bearings, frames is 3D printed.
More infos and instruction at the link below under: Documents Attached
The trickiest part to print will be the bearings, they can can be replaced with manufactured 608 bearings
Check out the PDF about 3d print a bearing to learn more about some of the settings needed
See the bearing here: