Palatis FricEx (belt driven friction extruder cold-end) (1.75mm filament)

An extruder code-end inspired by Gunstruder (https://www.thingiverse.com/thing:1247952).

I basically designed this to avoid griding into the filament.

Bill of Material:
1. 172mm (86t) closed-loop GT2 Timing Belt x 1
2. GT2 16T pulley (D13 * 14mm, 5mm bore) x 3
3. NEMA17 stepper motor (5mm shaft) x 1
4. D5 x 25mm shaft x 3
5. F685 (ZZ/2RS) bearing x 4
6. MF105 (ZZ/2RS) bearing x 2
7. M3 square nut x 4
8. sunken head M3 30mm x 3
9. sunken head M3 10mm x 1
10. sunken head M3 25mm x