Servo Tester Case

I printed the servo tester case by COGNETIC but there were a couple of unsupported parts in the base and this resulted in a couple of holes. I redesigned the 2 small bosses in the base to avoid these defects. My Bambu Studio slicer did not show any defects so I do not understand what happened.
For assembly, the top part with the raised letters is simply glued to the middle plate. This is just to make printing easier.