Try out Paxtruder hardware with your existing setup easily! Kit includes everything needed to upgrade an existing MK4 extender head to a Paxtruder including all hardware, acrylic, and Delrin parts. Use your existing gear motor, drive pully, heater assembly, and dinos with this kit by simply replacing your current extruder body.

See the Thingiverse page for additional details:
http://www.thingiverse.com/thing:1351