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One doesn’t buy a 3D printer to make a knob. One is suddenly presented with a need for a knob (or a thingy, or a flangle, or a twizzlet…) and suddenly remembers, “hey - I have a 3D printer.” Followed by “I wonder if there are any matching designs in one of the several massive free databases of models.”
Followed by getting out the calipers and opening OpenSCAD