Prusa I3 LCD Knob

I and my wife Mara, are assembling our new Prusa I3 Hephestos printer, so today we need a knob for the Lcd :)

Almost parts are 45 degree. The supports are just made for a minimal thing. Empty inside.

NEWS: The design is wrong. Because every printer print ad different size due to temperature, misalign, wobbling or any other quantum event :)
Would be better to make a cut of geometry and resize the part that fits on the the potentiometer smaller and see how it work... i can' t test it now.