BfB3000 mechanical Z offset

This thing will allow BfB3000 owners to mount a mechanical Z end stop switch on one side of their printer (either left or right) instead of using the original magnetic sensor / bed embedded magnet system.

If (like me) you're annoyed by a non-reapeatable Z offset distance from one print job to another or if you plan to mount a hot bed on your BfB3000, that thing might be usefull.

For a left side mount
- print "Zlimiter_big_left.stl" + "Zlimiter_small.stl"
or
- print "Zlimiter_left.stl" (