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This isn't very 3D printer friendly without a ton of support (AKA wasted PLA) 1 and 3 came out OK but 2 I just don't see any good way of printing it without a lot of waste (No slicer I have found lets you control what support is added so it adds it everywhere in sight) or redesigning it with only the necessary support added to the model

The instructions are for a one piece unit so they don't really apply to this 2 piece