Like the original, only base mountable at 50mm hole pitch which is Wades compatible. Quick-Fit version here. There is a slot for an M6 captive nut so you can add your own hotend or use the Recreus style one. Full filament support after the MK7 gear wheel allows a PTFE tube insert to be added down into the hotend for flexible filament printing. If you want to know how to print with this type of filament, please read the following article. Currently mounted and performing well on an old Prusa Mendel http://www.gyrobot.co.uk http://www.facebook.com/gyrobotukPrint with support due to Nema motor recess in rear of model. If using an M6 all metal hotend mounted directly into this extruder then a 40mm cooling fan mounted on the front face blowing air over the hot end heatsink is a requirement. Drill out hole if inserting a PTFE liner. Extruder : Tensioner :