An Arduino based Z Axis laser cutter controller by Martin Raynsford
The user pad has 4 buttons, one fast and one slow in either direction. If you push fast and slow at the same time the Z axis will datum in that direction, because the Z axis control system is now independent of the laser controller I’m able to adjust the Z height at any part of the program, this might not be the safest way of doing it but it’s pretty easy not to push the buttons while the laser is actually cutting.
Via Hacked Gadgets.