Normally I would not share a specific group’s post into this community, however I think it’s worth noting and is of interest when a company like @BCN3D_Technologies decides to open source their printer designs and software.
Other mods, please let me know if this is out of line. I’m not intending to show favoritism just hopefully good open sourcing. 
Originally shared by BCN3D Technologies
We are pleased to announce the release of the BCN3D Sigma design #opensource #3dprint
https://www.bcn3dtechnologies.com/en/we-will-release-not-only-the-bcn3d-sigma-design-but-all-their-know-how