Useless machine, inspired by and wired according to
http://www.instructables.com/id/The-Most-Useless-Machine/?ALLSTEPS.

Print:
1x base.stl (with Supports), others parts can be rotated so they don't require supports:
1x fingernail.stl
1x gear.stl
2x finger.stl
3x screw.stl

Electrical and other parts:

1. Motor 37-1216 RVFM Right Angled Motor and Gearbox 1:220
2. RVFM SP5-72GL140-A V4 Microswitch 37.5mm Lever S Tags
3. SCI TA202A1 3A DPDT Miniature Toggle Switch On-on
4. Battery pack from: https://www.thingiverse.com/thing:456900/#files flexbatterAAAx3.stl
5. various small screws (4)
6. solid core wire, solder

Let me know if it's not completely obvious to assemble. Wiring according to Instructables link: https://cdn.instructables.com/FOK/1HDA/GHHILR6T/FOK1HDAGHHILR6T.LARGE.jpg