Follow-up: WorkaroundFor anyone having this issue, there is a workaround: simply export the mesh as an
FBX. This issue appears to
only affect the 3DS formatted mesh. I've done some experimenting and I discovered the following:
FBX Format:Moving origin point doesn't cause this issue in Substance Designer.
Attaching or leaving the individual poly's "floating" doesn't cause this issue in Substance Designer.
3DS Format:Moving the origin point/resetting the origin point causes this in Substance Designer.
Leaving individual poly's "floating" causes this issue in Substance Designer.
Hope this helps!

~~ Nate