Hi Rik, well done on your submission.  I've sent you a note to your email on the Hexastorm web site.  Did you get it ?  Regards, Mark

Mark, saw your email on silver-halide printing / phographic laser enlarger. This is a cool idea. At the moment, the laser module only has 4 levels of gray scale. There is a digital potentiometer but it isn't tested at 2 MHz. Thank you for pointing out that there is similar project on Hackaday (https://hackaday.io/project/10101-direct-uv-printer-for-alternative-photography). Lasers are linear within a certain domain. There is a cutoff however. The current laser has two channels and potentiometer which can be set between 0-255. The laser doesn't turn on if the potentiometer is below 70. Also the laser power varies due to the optics. A laser systems is never uniform; the power is dependent of the scan angle. You can correct for this in your slicer. Still it can result in inaccuracies. For the rest see my emails.