Simple Compact Bowden/Direct Extruder with 625ZZ bearing

This is a part of 3D printer design, yet thought to dedicate a "thing" for it; **compact & small extruder (1.75mm filament) utilizing 625ZZ bearing**:
- plain simple
- just 2 parts: handle & base to print
- just a few other parts:

Bill of Materials (BOM):
- M5x14 or M5x16: mounting bearing
- 2x M3x8: mounting base to stepper motor
- 2x M3x25: mounting handle and spring
- M3 nut: insert into slot
- M3 washer (or print it): hold spring
- 20-25mm long **soft spring** (ID 3.2-8mm) or al