Friend asked me to make a hose fitting between his vacuum and his jigsaw. I built one 1 2 and then decided to invest in a solution that would help most people.
Customize your two nozzle diameters, the depth the nozzles can enter the fitting, and the wall thickness.
There is a small chamfer on the inside edge of each opening to make tight fits easier. There is a 0.5 lip to prevent vacuum suction pulling the hoses too far into the adapter.
The diagonal section between each hose fitting is 45 degrees to minimize support material.
I recommend you print 0.2mm diameter more than your hose to compensate for print quality. if you find the fit too loose, put a single piece of masking tape around the inside of the adapter which should eat 0.1mm.
Please include the two diameters in your remix title so that others can find and use your design easily.
Another great creation from https://marginallyclever.com.