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Thanks for the nice comment and the advice, Dave. It's good to know about the pen, and if I were still cutting the squares out with ruler and scissors, I would certainly use it. However, I've been using quilting gear (rotary cutter, mat, and straightedge). After some trial and error, I've found that (as other people suggested below) it's faster than cutting squares out the old way, they make straighter squares, and I don't need to mark the felt at all.