EngineerDog | 3D Printed Toilet Sink Demonstration @MGrahamMakes | Uploaded September 2015 | Updated October 2024, 1 hour ago.
A 'toilet sink' is just a simple plumbing hack that lets you wash your hands with the fresh water a toilet uses to flush. In this way it can reduce your water consumption by eliminating the need to use even more water to wash your hands.

Free build instructions here: instructables.com/id/Save-a-Little-Water-with-a-3D-Printed-Toilet-Sink