I think that the sand paper idea for smoothing the rough edges sounds like a solution. I have only seen a few 3D printer objects - mostly earrings and pedants.
I like this idea of custom bone folders. I have a good size collection of various bone folders. I still have the first bone folder that I ordered from Lillian Oppenheimer in the 60's. I considered it expensive at 50 cents at the time. It was slender. It started with a rounded tip and widening a bit to a wider rounded bottom with a small hole in the base. Currently, my favorite is a (excuse me for the reference) is one by Martha Stewart. I get them at Michael's or A.C. Moore's with a 40 or 50 percent off coupon. I like the way it feels in my hand. I have had somebody say that they thought it too big for their hand. I carry around a bamboo "folding bone" which was actually a seam turner. I had purchased a few bamboo folding bones when I was in Japan for the NOA and JOAS conventions in 2001. Nicholas Terry has some hand carved folding bones which are quite nice. I have liked the ones that Leyla Torres sells on her website. When I was in Germany, I met someone who's husband made a few wooden bone folders from special hard woods. My wife likes one of them. Arlene and I both have Teflon folders but I do not carry them around with me as they are expensive. They are OK but except for rare occasions - I do not use mine. I have used the "milk bone" folders from the milk jugs. There advantage is that they are free if you can find them. I have been having problems on that end. We also got some Lottery ticket plastic scratch off plastic thingie that works as well. I still prefer the ones that I carry. All of this comes down to: be careful when finding your design for your bone folder - find a design that you like. Mark Kennedy
