To be fair, they also made a number of fixes and improvements in the base code itself and like good Free Software citizens, contributed them back to the project. Those contributions are in the current 1.0RC2 release of FreeCAD. I think they were wanting to try the same play that launched RedHat back in the day. I appreciate their contributions and I’m sorry it didn’t work out for them.
I got really good results with CC3D GID PETG and a steel nozzle.