Z shaft support fixed

The original files had invisible overhang walls that split upon insertion of an 8mm rod (as shown in the picture from the original installation). I simply ran the fix in Orcaslicer, and the issue was solved, as you can't see the dark blue features in the picture. 

Print 2 per model as per original, 4 pieces in total

ran through fix via orcaslicer/windows utility, possibly corrupted geometry in original