This adaptor uses the original clip in collar and allows you to use 50mm ID vacuum hose. You need to separate the two parts first and replace the original hose adaptor with this one. Then screw in 50mm ID hose into the reverse thread. The two should pull apart with some force or use a screw driver to pry them apart. Prints without supports.
https://www.buymeacoffee.com/unclerob
The author remixed this model.
Redesign to fit my model shopvac. Also redesign the threads to fit 50mm hose better while still being an easy print.