Extrusion knob with M6/M4 screw
thingiverse
Make 100% infill at 45-degree support of 85% for a great 5.2 hole structure. Get your awesome Tesla filament here: https://teslafilament.com/ I've updated the thing to TESLA Extruder Knob with M4 screw MK-IV. No need for supports, use any infill you like. Simply screw in an M4 set screw - no tapping required.
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