Focus-tool for chinese k40 lasers

Laser gauge for the popular K40 laser cutter/engraver without nozzle, to set proper height between material and lens.

DXF and STL files included. I have not tested the STL file so it might be a bit rough.

How to use:
The guage has steps, use the highest one for engraving, set the gauge between material surface and lens holder underside.
For cutting, take 50.8 minus half material thickness, use that to set proper height.
See picture how to place the tool on the edge of your K40 laser noz