After using B2D for a while now - (actually a full year TO THE DAY!) without any problems I just ran into my first problem and broke this part.
So here's a stronger part that is based on my experience...
Just to make clear it's now for M3 machine screws instead of the original M3 button head which I normally do not use.

Here's my original make
https://www.thingiverse.com/make:406064

Enjoy!