An adapter to clear the dust wile sanding wooden pieces or something else.

Fitting 
This adapter fits to the outlet of the Bavaria Bos 150/1 sander (d 39.5mm) and to a vacuum hose that is (31.7 mm) but you can scale it to fit your needs. The diameter of the plastic tube is (38.5 mm).

Printing orientation
I suggest to print the parts vertically with no supports 

Infill and walls
I suggest above 2-3 walls and 10-15 infill or solid.

I hope you find it useful.