I made this vacuum adapter for my Metabo KGS 216 to fit the big attachment with 46mm outer diameter of my Makita VC2512l vacuum. Beside this it holds the vacuum hose in place while rotating or cutting. Before it was hardly possible with all the attachments that comes with the Makita vacuum.
Here is a screenshot of the variables available in the VarSet of the FreeCAD project file. That values suited the best for my Metabo KGS 216 and my attachment of the Makita VC2512l vacuum.

The author marked this model as their own original creation.