A couple of weeks ago, I noticed a new feature in OnShape: Sheet Metal Models. It almost sucked me into a rabbit hole, but my objective was drawing a driver, not experimenting with cool new features. So, I parked it until this evening, which I seem to be spending babysitting the Cricut as it makes Christmas crafts for The Girl.
With a little experimentation this feature could be a game changer for designing etched parts. As you design the 3D part, the flattened version of the part can be simultaneously viewed. Being a machine, it calculates things like the amount of metal that goes into the fold, based on the K-Factor of the material. It also stops you from making some impossible shapes.
Sadly, the tool doesn’t know about etched fold lines, and so, a little more experimentation will be required to find the proper K-Factors. However, it looks like it may be possible to export the pattern straight into a flat drawing program like InkScape to lay out the fret. I envision a whole new world of origami modelling!