Hi again,

I also dont think that the peachys laser power is the neckbottle.
Also if its not so strong the longer we let the beam at one point the energy and uv emitting is kumulating the effect.
I think we can say the longer it is the stronger it is.
Its just to destroy the uv sensitive filmlayer, it dont has to burn it down or mill it away.

But maybe that you are right with eycare issue, maybe the copper is reflecting the beam and hits someones eyes.

I think the whole point is about calibration for exact measure and scale.

Also a point could be layout conversion from pcb design software and slicing software model ....