Cutting Acrylic

Hello, I have a 60w k40 machine with an upgraded c3D board. I am cutting 1/8" cast acrylic and the cuts start off beautifully but after about 10 minutes the cuts start “melting” together.

Does anyone run into the same problem? Thank you!

Can you provide more info as well as photos? A photo of the “good” part of the cut and a photo where it starts “melting” together.

If it is cutting all the way through and then melting together, it suggest you should speed up, so you put less energy into the cut. At least that is the way my plasma table works and there are a lot of basic similarities of how plasma and laser cutters operate.
Fred