10-24 Thumbscrew/stop nut.
thingiverse
Remixed parametric knurled knob used on my razor guillotines. The hole is sized so that it also works likes a stop nut. The recess for the nut is slightly undersized so heating the print up before attempting to press the nut in is mandatory but results in a snug fit. The hex nut sticks out about 0.5mm to prevent wear on the face. Use with a flat washer for good results.
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