Machining ABS plastic

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lower the rpm or increase feed. The problem you are having is heat generation so you need to remove that heat, The main way to do this is by removing a large amount of material that carries the heat away more effectively. You will also travel more distance which spreads the heat rather than concentrating it in a smaller area.

An air blast will obviously help to keep swarf away and help with some cooling but the main cure is feeds and speeds. It's also important to make sure you have no melted plastic residue in the flute of the cutter, if you have new swarf will have a bigger tendency to re stick that that plastic coat as its thee same substrate. Make sure you are removing all the old plastic residue. You are using the right cutter using a single flute, the quality of the cutter can have an effect the better the finish in the flute the less sticking you will get. It's a similar principle to more ductile aluminiums (not gummy, no such material property) Give it a go and see how you get on. I machine a lot of molded abs electrical boxes and its not a problem if you know how to approach it. Many business struggle with abs so its common problem for many, mainly because they try to treat it like a metal.