Ender 3 Extruder Knob with Set Screw

This is a modification of the knob model created by user 'pixel2,' I recreated it in fusion360 and lengthened the stem slightly and added opening for M2 set screw.

*** I'm getting a few messages with the same complaints, if you are having problems fitting this please read:

-This model was created to be dimensionally accurate, the shaft of a stepper motor is a standard 5mm diameter, the opening in the knob is 5.2mm (5mm +0.2mm tolerance). Even if you follow the described print settings your accuracy will vary based on your printer, settings and material choice.

-For an exact fit when your accuracy is not quite right, heat the shaft opening with a lighter for a second to soften the material then place it in position, do it on one motion and don't continue to adjust, allow it to cool, then remove and you'll find you have an exact fit.

-The set screw opening is just a 2mm diameter hole, you will create the threading yourself when you install your M2 screw, do this before trying to install the knob on your stepper motor. Clean up any debris, if your opening is very far off you may heat it to ease the threading.