JKForest_MK8_extruder

simple extruder for MK8 gear.
bearing is 688, used for inline skate.

i used inner 3mm outer 4mm brass tube instead of C parts.

it required:

1. 5~8mm countersunk M3 bolt * 1
2. 8~10mm M3 bolt * 1
3. 20mm M3 bolt * 2
4. flat washer(3mm) * 2
5. spring (around 20mm) * 1
6. 688 bearing (8 * 16 * 5) * 1