This is a replacement knob for the $199 Monoprice Select Mini, the origional knob isn't the most pleasant to use since you can't grip the sides to rotate it. This knob extends past the front of the printer enough to grip the sides making controlling the printer easier.
I made some slight adjustments to the designs of both knobs, the major one being that the hole for the potentiometer stem is no longer deeper than the length of the stem, if there is still an issue please let me know so I can fix it. I have also added a variation to the origional design that just has a flat part in the middle rather than a 1mm tall dome. V1 and V2 are the same model as the origional, just with changed names so the download stats are no longer available on them. V1.1 and V2.1 are the two with the new hole depth, and V1.2 is the one with the flat top.