In the process of creating a fully assembled min-kossel in FreeCAD I ran into some difficulties importing SCAD files into FreeCAD.
FreeCAD does a great job of importing the files, but a little prep work should be done to the SCAD file to get a better result.
Subscriber Keith Sloan points out an excellent refinement to this process, using the Max. Faces Parameter, see his comment pinned below.