Ender 3/Pro extruder knob that holds on to the hobbed gear

thingiverse

Printing with precision demands a damper adjustment that relocates the hobbed gear up the shaft, leaving minimal room for most extruder knobs to grasp. Typically, this knob latches onto the hobbed gear instead. The notch at the end of the shaft aligns perfectly over the grub screw protruding from the gear. To ensure a smooth installation, a cutout is provided in the design for the motor shaft if you're working with an unmodified extruder motor. For optimal results when printing with PLA, utilize the extruder-knob.stl file. However, if your prints exhibit perfect dimensional accuracy, consider using the more precise extruder-knob-dimensionally-accurate.stl model.