3M WorkTunes On Off Volume Knob

This knob fits a 3M WorkTunes Hearing Protector / ear muffs; after printing, heat at 170*F/until soft, press onto shaft.
13m
1× print file
0.20 mm
0.40 mm
1.00 g
0
0
0
11
updated March 31, 2025

Description

PDF

To work with the 3M WorkTunes, I had to heat up the knob to 170*F, press it onto the shaft, and let cool.  Heating the knob and allowing it to cool on the shaft is what makes the splines on the shaft bite into the plastic.  I did not try to print it without undersize and not sure how that would work as there are no internal splines on the knob, only the external splines on the ear muffs.

Model origin

The author remixed this model.

Differences of the remix compared to the original

I shortened the original knob and undersized it slightly to minimize the amount the knob protruded from the ear muffs.

License