The clock knob of this oven has a small diameter grip which is difficult to turn, especially with wet hands. I designed a bigger one which has a good grip. It works but I have a problem: until now I only print with PLA and that has a too low melting point. You need ABS or similar.

knopf02 is the version I printed. It uses a inner diameter of 6mm, but with my printer that results in 5,5mm which I had to drill out. knopf02a is a bit smoother and uses a wider inner diameter which should result in the correct value.