It is printed standing up like on the picture. The endstop is angled at 45° so it does not need supports.
The cut piece is for test-fitting your mSD extender cable without wasting filament, you can check the fit and adjust the scale of the full model.
Improved_Micro_SD_Extender_Slot.stl | 3.2KB | |
Improved_Micro_SD_Extender_Slot_1.stl | 2.6KB |