As it turns out, there was more at hand than a single degree error, now rectified. Thankfully, the method I mentioned in my last post was a success! However, I am now a couple of segments short. The laser power was now fluctuating to the point it could no longer penetrate the perspex I was using. Very strange. Marginally changing the power settings had no effect (I was using settings recommended to me by the laser’s owner). A test cut in my material of a small, 8mm diameter circle was a success. I set up the laser to cut a single segment. The image was perfectly transcribed into the plastic; but not through the plastic. Looking at the cut it became apparent that the laser power was decreasing with the length of the cut; the start of the cut penetrated the 3mm perspex with no problems, but after 30mm or so the beam no longer penetrated. I’m not sure how deep the cut was at the end, but I couldn’t press the shape out nor free it with a Stanley knife.
After a couple of weeks, other users’ experiences of the laser came to light and the alignment issue seems to have reappeared in addition to the power issues. As I type, new parts (a tube and mirrors) are being shipped from abroad in an attempt to fix the issues. Lets hope so, as I may be struggling to find another laser cutter if not!