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Anonymous
I think you mean card/posterboard; if it was just paper, you would just be cutting all the way through it into your desk. ;) When I first started, I used a thick posterboard as well, but after a while, your knife will begin following the left over cuts from earlier builds. Rubber self-healing cutting mats will, well, "heal" themselves (the cuts will "close" as you will) so you won't accidently follow previous cuts
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