K40 CO2 Laser Engraver Focus Tool

A small tool for quick checking the K40 laser engraver stock head distance from the material surface - just select the slot based on material thickness 1...10 (mm) or use the top, zero, for carving adjustment. There is also a tape measure (length 110 mm) on the other side. I've found this piece of plastic quite useful and kept it hanging attached to my K40. I just made minor modifications (e.g. removed my logo) to the stl file attached to make it more convenient to share...