BCN3D+ direct drive extruder

I was sick of the original extrude which was chewing the filament.

I'm using a 7mm diameter filament pulley (aka MK8 filament pulley). With it, my firmware extruder's feedrate is set at 138 steps/mm (driver setup is 16 microstepping).

Extra parts needed:

- 7mm diameter filament pulley
- 1x 624ZZ bearing
- 1x M4x8mm flat head screw
- 2x M4 nut

I also migrated to 1.75mm filament ( the 3mm one was breaking alone overnight, and also harder to feed )


See it working here: https://y