I was making a filter for my laser and needed to go from the AC Infinity charcoal filter to a duct flange and wanted something easy to remove when the time came to replace it. These couplers exist in the wild but they are hard to come by and expensive, so I just printed it in some spare TPU I had laying around.

It is made to work with 12" hose clamps (mine are 0.5" wide) but honestly they just barely fit, so if you can find 12.5" or 13" that will fit better. There are slots to hold the clamps in place while they are loose so no fiddling around required.