Thanks for the input on that. Interesting that Acetone can attack the plastics!
I decided to adapt my board to 100mm width and get it made by Seeed. But, when I change a drill to anything other than 0.6mm the Seeed 1.1 DRU produces drill size errors. So drill = 15 mils produces DRC drill size errors on layer 20, yet seemingly the same config in DPv2 BRD file passes the check just fine? What am I missing!? EDIT: Turned out I'd put a value in the net classes at some point.