Replacements for the cranks and "swivel blocks" on the Black and Decker Workmate Portable Project Centers.I initially modeled both the crank and block in Sketchup. However, I wanted a simple OpenScad project, so I re-did the crank in OpenScad. I found that the tangs on the crank are rather weak; the original B&D cranks suffer from the same problem. I found that printing the crank on its side helped avoid separation between layers. You can buy replacement swivel blocks for about $9 for four, but who would do that if they had a 3D printer?