We found this on the offcuts shelves. It looks like it’s been attempted to be lasered.
This is foam core board. What seems to have happened is the laser cut through the outer cardboard and then set fire to the plastic foam underneath.
Would be good to find out what happened here. Anything catching fire in the laser should be reported to @lasertechs and the machine put out of service until it can be checked over.
It’s worth noting that foamcore board is not in the list of permitted materials. This doesn’t mean it’s forbidden, but @lasers need to check in with the techs and other members on DIscourse before attempting anmy material that’s not on the list.
We’ve given the machine a clean the bed has a reasonable amount of residue baked onto it, as well as the other surfaces. Mostly it’s wiped off OK, except on the bed itself. We have cleaned the optics, they have not been damaged fortunately.
Also the kerf is a bit wider than usual, but I think that’s down to the lens being slightly scratched.
We have noticed a widening kerf being the result of a slightly loose lens. It seems that lots of etching in the Trotec (with accompanying repeated, rapid back and forth motion) sometimes shakes things a bit loose. On the other hand, foamcore does seem to be an accident waiting to happen (especially the thicker stuff)…
Are you saying the lens is no longer held in its holder?
Given that Peter lives in Brisbane and is not a member of SLMS, I think it’s safe to say he’s not talking about our machine 
The lens remains in its holder (or appears to), but the threaded ring holding the lens holder in place unwinds, and the lens (in its holder) slips downwards. At a glance, all appears in place, but if you reach in, the lens is loose. (We have a version of the lens setup whereby the lens sits above the locking ring - a Trotec innovation apparently).
And yes, I am not talking about your machine, but since we also run a Trotec Speedy, I reckon some things might still be relevant.
Yeah, sounds like a different design to ours. We 3d-printed a new lens holder to enable the use of 20mm 3rd party lenses (the Trotec ones are 19.8mm) which is a very snug fit on the rails. Even if the locking nut is loose, it shouldn’t shake out.
