Hey all, SketchUp used to be free to use on the desktop. They stopped updating it in 2017 but it’s still available for download from SketchUp:
https://help.sketchup.com/en/downloading-older-versions
That version is fully functional, and totally free to use. Fabber is fully supported for this version as well.
As it generally goes with SketchUp, older versions have a very long shelf life.