... the best comercial galvo-heads are only good for 250x250mm and then with a really expensive f-theta lens-head to define a sufficient focus plane.
The actually best methode is to fit a BluRay-diodehead on an old XY pen plotter (one where you can remove the bed) and replace the electronics with RepRap-style drivers and controller ...
The actually best methode is to fit a BluRay-diodehead on an old XY pen plotter (one where you can remove the bed) and replace the electronics with RepRap-style drivers and controller ...