The exhaust vent inside the K40 juts in quite far and actually obscures the laser path when Y is zero.
Unfortunately taking out this vent to trim it on the bandsaw require removal of the gantry that is in the
way, in turn this would require re-aligning mirrors. I decided to do it differently.
Incidentally, later I discovered that I did not trim enough to clear a 3D printed air assist nozzle and had to trim for the second time. So, if you decide to do this, be more generous in trimming. :-)