If you print these files as they were created, you will usually get a little "bump" of hanging filament at the little triangle. If you want a tight fit, just remove a little bit of it (e.g. using a file or SAK).
DocVader_CTC_Dual_LeftTopBack_CornerHoleCover.stl |
DocVader_CTC_Dual_LeftTopFront_CornerHoleCover.stl |
DocVader_CTC_Dual_RightTopBack_CornerHoleCover.stl |
DocVader_CTC_Dual_RightTopFront_CornerHoleCover.stl |