Anybody reproducing old style speedo gears?

Actually, I'm thinking about having some made. My son is writing code/programs for 3-D printing (as well as working on getting a 3-D scanner), and starting to play with some different types of plastics, nylon, etc. I've got 3 or 4 in my stash of parts, so I'll give them to him to pattern and see how he does. BTW, do you still have Geord's T/A, Barry?