I needed a case for my PWM controller and was learning Fusion360 so I designed one.

I used this youtube tutorial as a guide to make the case.

The case snaps together using two snap joints and is fixed by registration edges all around. The PCB is fixed in X and Y by four cylinders that fit in the PCB screw holes with 0.3 mm clearance and in Z by four cylinders that sit on top of the screw holes with 0.2 mm clearance.