At the moment I'm building a teststand to figure out whether things behave like they should or whether I have to change something.

I placed the galvo assembly and the laser in a cash case to prevent directing uncontrolled laser beam reflections into the room. The mounting parts are currently made of PLA, but I think I will replace them with metal parts later, to prevent them from catching fire when using more powerful lasers.

A test run with a 2.5W 450nm laser. It seems to work like it should and I will clean up the code and build a machine frame next.

I added a MOSFET as switch to simulate an endstop trigger event when the galvo reaches the end of the axis to keep the machine controller and Step/Dir Converter in sync.