Soap filler / refiller / collector

thingiverse

A simple threaded coupler to use between two soap-dispensers for either refilling or collecting the leftovers in a single bottle. It is made for the threads of what I think is the most normal cheap soap bottles, around 27,5mm across the threads. It works for me, might work for you. Final version has a bit more room for a washer after the threads, and the threads are more prominent (1,2mm instead of 1mm) making it easier to screw the bottles tight. Version 6 can be used without a washer, I just felt more secure with it in there. I have sliced it in PrusaSlicer with automatic supports: Contact Z distance: 0.2mm XY separation: 85%