Dasaki MK8ish Direct Drive Extruder for Prusa i3 (MK7 drive gear)

thingiverse

Extruder based on the mechanics of the MK8 aluminum extruder for NEMA 17 motors. There are two versions, depending on the filament used. Two options exist for each version: one with the motor pointing to the left and another with the motor pointing to the right. It allows a clear view of the filament input hole. A filament guide/pressure adjustment mechanism is included (use some glue to fix the knob to the M4 screw). Additional receptacles are provided for captive nuts to attach your own devices (depth probes, fans, etc.). No supports are required; they're included in the 3D models. You will need a hobbed drive gear (MK7 with an approximate 10.56mm effective diameter) and the following hardware: one 623 bearing, one M4x10mm-15mm screw, hexagonal head (knob), one M4 nut (knob holder), two M3x30mm screws (motor/assembly), one M3x10mm screw (bearing), three M3x25mm screws (motor/filament guide). If you're a curious maker or hacker, visit my blog at http://www.therandomlab.com.