Rusty Old Box Fan Knob

We have a number of aging "Lasko" box fans. One of the injection molded knobs failed. The plastic became brittle and there wasn't much of it. I made this replacement knob in OnShape, which should outlast the fan.

Unfortunately the switch underneath was not a simple D shape, it was much more ornate. I did my best to replicate it and was worried that it required details too small for my printer (Prussa i3mk2) to reproduce. It works fine.

https://cad.onshape.com/documents/35be403c41f870f32c11c22b/w/d9c1fcdc714015c9e4a9224f/e/2b9c8e7b194f4e2942cccd14

Note the photo shows the pips I added to the side to indicate the setting, but they are reversed. I fixed the model before I posted it.

I recommend ABS for this purpose, as it is less likely to crack and fail. But PLA should work fine.

Be sure to print this "top" down. Support is not required.