Nope! I gave up an tried turning my A5 into a coreXY setup. That is still ongoing.
I do have a coworker with a metal lithe and he said he could make some for me
@ztf the glass will etch wherever the laser meets resistance. in your case, it is the "underside" because the laser it actually etching the material under the glass and the heat is transferring to the glass.
Like @nottingham82 said, i use black spray paint or acrylic paint to etch on the "top" of glass.
@vivek.khanna my first engraver was an A5 with a 2w laser. the wheels failed on it (white POM version) and instead of buying more, I tried my hand as a corexy setup. For now, it is a vaporware project. I tried to use EMT as the rail (hey, it is what I had at the moment)! I need to add some real linear rails and redesign the corners, then it will be a fun little machine. just need to pick up rail first. Sadly, it is not at the top of my list of things to do.
Another thing you need to do to cut is to raise your material so there is an air gap underneath it. It allows the gasses to escape.
That looks like typical backlash
Three things to look at.
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