[Nemo_bis]

Your problem is probably with distribution and distribution in modified form, i.e. freedoms 2 and 3. https://en.wikipedia.org/wiki/Free_software#Definition_and_t...

You don't need to distribute or license the software or process you use to produce the printer itself, I suppose.

Help is available to choose a license which fits your needs. https://opensource.org/faq#which-license

[icebraining]

All open source licenses would allow competitors to build and sell their own clones, which is what mchahn doesn't want.