My kids broke the dimmer knob in our bathroom. And instead of buying a 10 euro replacement I designed a new one in Fusion 360. This model is stronger then the original and takes less then an hour to print. I printed it in PLA+. The pictures of the knob shows how it looks after half a year. Its holding on strong. 

print settings:

layer height: 0.2

Walls: 4

infill: 15% Gyroid

Supports: no