RepRap Universal Mini Extruder
thingiverse
This printable extruder is intended to work on RepRap Mendel (both standard and Prusa), RepRap Huxley, and virtually any other open-source 3D printer you can find. It features: 1.75 mm filament Adaptable mounting plate to attach it to virtually any 3D printer Very compact high-torque NEMA 11 motor Active ducted fan cooling for high reliability Wade-style hobbed bolt filament transport Wing-nut drive to spread the torque loading on the plastic gears Push-fit hot-end parts - no thread cutting Easily replaced PTFE liner for the hot end A single M3-threaded rod cut to lengths makes all the fixings Lightweight: 420g Compact design (110 mm x 90 mm x 80 mm) I based this design (loosely) on Jstkatz's extruder (http://www.thingiverse.com/thing:7037), in particular, the idea of using a lever to trap the filament against its drive. Instructions The full Bill of Materials and detailed construction instructions are on the RepRap Wiki here: http://reprap.org/wiki/RepRap_Universal_Mini_Extruder.
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