Dial indicator gauge Gregs extruder calibrate Z and hotbed

Calibrate Z and hot bed.
For installation you need:
- Plastic part published
- 1 bolts allen M4 x 20 or 25 mm
- 1 nuts M4
- 1 bolts allen M3 x 10 or 15 mm mm
- 1 nuts M4
- 1 Dial indicator Gauge 8 mm diameter shaft