A lid for mason jars with threads for a soap pump. I re-purposed pumps from old soap containers and added them to the mason jars to create refillable glass soap containers.
The disc seals the jar and acts as an adapter for the pumps.
Printed with 2 layers top and bottom with 25% honeycomb infill on the disc part.
Works with pumps with threads approximately 27.5mm diameter and 4mm per revolution. This seems to be a fairly common thread for these types of pumps. Method and Aveeno brands both had the same threads.
I couldn't easily find a matching thread in Fusion 360 so I made my own by creating a spiral with a triangular cross section and then chamfering the outside and inside of the threads.
It seems to hold well enough for this purpose.