Made to fit a 40mm vacuum hose to an unmodified Hose Fitting from @PeterH's “Camlock Connectors with Magnetic Catch”. At the fitting side it screws in easily, at the hose side it is a bit more snug. If it is too snug, use the Offset Face feature in Fusion 360 on the inside of the thread/coil. STEP file is found below.
Note that these hoses have a reversed thread so you have to turn them the “wrong” way.
The author remixed this model.