Spent quite a bit of time brainstorming and designing the extruder. This is a challenge seeing there is requirement for low mass and volume.
Here is a mock 3D model of the amalgamation of ideas i have been brainstorming:
Specifications: (Estimation of Mass)
- 2 x E3D V6 hotends ~70g
- 2 x GT2 40-Tooth Pulley ~ 20g
- 2 x GT2 16- Tooth Pulley ~ 5g
- 2 x Nema 17 Pancake Stepper Motor 18Nm 180g
- 2 x MK8 Drive Gear ~ 5g
- 2 x Precision Shaft ~ 10g
- 4 x 625 Bearing ~ 10g
Torque per filament feed: (40/16)*18Nm = 45Nm
Estimated total mass of these parts: 640g
Of course more parts such as body and bearings will add mass, but will be minimal.