Hobbed Bolt Bowden Drive

This a RepRap extruder driver:

• For Bowden extruder
• Uses an M8 hobbed bolt
• Frame mounted: Mendel and Huxley* frames

Print:

• Hobbed Bolt Bowden Drive
• Idler (Jonaskuehling)
• Big and small gears (Jonaskuehling).
  I used the 'fixed gears'; both sets are included.
• Frame mount (RepRapPro)
• Coupling tongue: (RepRapPro)

Hardware:

• M8 hobbed bolt (ebay)
• 2 x 608 bearings (ebay)
• M8 washers (3-4) and nuts (1-2)
• Idler: J-kuehling suggests M4 x 60 (2) + nut. I'm using 1 M4 x 35.
• Idler (hinge): M3 x 30 + nut
• Frame mount: 40mm M3 screw and nut

Other:

• Nema 17 stepper motor
• Bowden Hot End (tech3d.org or RepRapPro)

NB: I've added a modified Huxley Mount. I haven't tested this as I don't have a frame. Let me know if you try it. :)