now shipping Version 2.0
Specs:
- Gear ratio - 7.5:1
- 12 mm diameter filament pushing gears
- Filament pushing force:
- LDO-36STH20-1004AHG 20mm stepper up to 9.4Kg 1 amp
- Filament acceleration up to 600mm/s^2
- Retraction speed: 60mm/s(24V power supply), 30mm/s (12V power supply)
- Overall weight is about 140g (with the 17mm stepper)
- Maximum operating temperature ~120 C
More info:
https://www.thingiverse.com/thing:4725897