Now that I’ve rebuilt the system to use bypass/full/low presure for air, it was time to reduce that gap between the nozzle and the surface. My gantry and laser head seem to be different than “normal”; vertical belt and head mount, and the lens mount in the nozzle, not the tube.
It came with a 38mm lens with 4 or 5mm to the surface. With a 63mm lens, I was 29mm to the surface. 3D printing to the rescue. The extension fits between the tube and the nozzle and moves the lens mount to the top of the extension. I’m now at 7mm to the surface. I can continue to adjust as well as adjust for the 50mm or 101mm lens as well. Air assist becomes much more useful, now.