SFT Direct Drive Extruder
thingiverse
Concept for a simple adjustable direct-drive extruder. A ball bearing is mounted onto the fourth screw hole of the NEMA17 with a slightly non-concentric lever that enables pressure adjustment. Two M5 nuts can be inserted for Bowden-Tube Push-Fit connectors. A 4x2mm PTFE Tube may be inserted to guide the filament path. The extension ring for the bearing may be printed with flexible/rubber filament. The left part has to be printed twice. ;) An additional frame can be used as spacer between the stepper motor and the extruder and to keep all four screws in place. First test of concept:http://www.youtube.com/watch?v=tJi8mBMc3ug
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