I found the original model too flimsy and the screw hole snapped very easily.

I have made it thicker and added a central rib for strength. Made the screw mounting face thicker and changed the 90° angle with a small fillet to improve strength. Also added a bit more material to the whole face for even more strength.

Don't get me wrong this is still easy to break when removing the support from the screw hole but it is quite a bit sturdier now.

Creality

Ender 3

No

Yes

0.2

35%

Print with 2 or 3 walls for extra strength and a small brim to prevent warping. Supports should only print in the screw hole and if possible do per model settings and make the screw face more walls (perimeters) so it prints solid with no infill.

Obviously print with flat (internal face) side down