Rando Bowden Extruder

thingiverse

This minimalistic MK8 extruder has been in use on my Replicator for a long time, and I've converted it into a Bowen extruder. It shares the same bolt pattern and retention for PTFE tubing as the airtripper extruder. The conversion is straightforward with only three printed parts needed. This extruder works well with 1.75mm filament. While not necessary, I've included a front plate to support the shaft from the motor, with a viewing port for the gear and filament. This is part of an ongoing project to develop a Bowden-style conversion package for MK7/8 or qu-bd extruders; hot end parts are currently being worked on. You'll need a Nema 17 motor (preferably with more power), an M4 nut, PTFE tubing with 4mm OD and 2mm ID, two M6 bolts and nuts for mounting the extruder, four M3 bolts of varying lengths depending on cover use, a 1.25" L x 0.3" W spring (McMaster #9657K331), a 10mm OD 3mm ID bearing (McMaster #7804K128), an M3 10mm flathead screw, and the MK7 drive gear from MBI or Raptor Universal Filament Drive Gear from qu-bd. Despite potential slicing errors in the file, it still prints correctly.