Need help with laser cutting acrylic

[mondrota]

Hi, I've done the ramp test and set the z height accordingly. I use the air assist, I've tried it on full air flow and restricted but it didn't seem to make much difference. I'm using the compressor supplied with the laser.

I'm not sure about the paper tape on the bed, I think I'd only get a dot as it's focused at that point?

Thanks

[Nickhofen]

It seems that at the points that the material is melted, that the beam is focused at a different height than at the rest of the material.
What I mean is that the beam is focused higher or lower.
Did you try to cut something else? That melt happened at the same distance from XY 0 on the new material?