I've seen this type of scroll saw table insert in a lot of scroll saws, but had difficulty finding a replacement for mine. This design is perhaps a little smaller than I would like (by 1/2mm overall radius, and perhaps 1/4mm to short), but I'm pretty pleased with it and a lot closer to proper dimensions than the piece of Masonite I had cut a replacement out of before.

You'll want to rotate this so that it prints flat on your printer.