Have you (or anyone else here) ever played around with FreeCad? It’s an open-source 3D parametric modeler. I’ve only heard of it and have never tried it, but it might be a solution for anyone trying to monetize plans or items produced by it.
I have tried it, but wasn't happy with it. Mainly because making a series of drawings (for printing) was in my opinion not possible within one file. However it is a "small" program and you can download it easy, for perhaps it is sufficient for you. BTW there are plenty of vids on youtube
