There is a part of the wd3 premium that is prone to breaking where the handle meets the hard hose and I didn't want to waste the whole hard hose or the 5$ to replace it so I made this small “Patch” its a friction fit no glue should be required you will however require a mallet I printed it with overture pla+ she works well for me layer lines are matching the force profile for standard vacuum use.

if it is too loose due to your printers tolerance a little bit of cloth tape with snug her right up.