John,
when opening the Shaft_Collar part in stp format the following error is revealed.
edit: Also, the Vex_motor as well.. same error.
Quote:
Imported1: Warning: During geometry integrity checking this feature is found to create invalid geometry.
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They look ok though, (all surfaces are joined correctly as far as I can tell) but they just have that error.
I opened them in SolidWorks 2001 Plus btw.