Get yourself a deburring tool! Don’t know what I would have done without one. Many builders report losing some quantity of blood in the deburring process. But with a deburring tool, it is so slick. Both domes and rings took about 45 minutes total, and now all those jagged laser-cut edges are smooth and soft to the touch, and I’m able to grip any part of the dome for the next phase of sanding and polishing.