Direct drive planetary gear extruder for 1.75mm filament. This extruder designed for vertical X-axis(mendel) mount, but it easily can be adapted to any other type of carriage or filament diameter. You can fit any J-head hotend. I use for this setup: hotend http://e3d-online.com/E3D-HotEnds motor http://e3d-online.com/RepRap-Spares-Electronics/RepRap-Motors/NEMA17-Geared Bearing http://www.ebay.co.uk/itm/4-x-Bearings-3mm-ID-x-7mm-OD-x-3mm-Wide-683-ZZ-/120628475606?pt=UK_ToysGames_RadioControlled_JN&hash=item1c160476d6 I finish printing extruder, I quite happy with the result, I print my extruder with ABS 0.1mm 50% infill, it took me 5 hours to print Extruder insert need to be printed with ABS 0.1mm , 50-75% infill, it takes 35-50 min to print