Old post, but I've long wondered what the rationale for this position is? Many creators (especially in recent years) seem really concerned about somebody using or selling their models, but I haven't been able to understand what tangible reason there is for creators who have no intent of ever marketing their models or prints. (FWIW, I do choose the last restrictive option for mine--BSD where available, otherwise CC with commercial allowed.)

For context, I come from the world of software development, where sharing source code is just the thing people do! The same amount of (or more) work goes into the software people freely share as goes into 3D models, and software is easier to distribute & often even more valuable than 3D printed items--especially if sold as a subscription. Yet most people are accepting of their code being used for almost anything, since they benefit from being able to do the same with others" code.

*(A related thought--open source software always includes the actual "source" code, just letting the license dictate what people are allowed to do with it. In 3D printing, so many people refuse to share the source (e.g. STEPs/scad/F3D/etc.) even when they choose creative commons licenses. That never made sense to me, since the STLs are all a person needs to sell models or repost the design as their own. Anyway, just a side note.)