This is a rather niche model but I figured I'd upload it in case someone is in the same situation I was in. It allows you to fit an Electrolux Ergorapido nozzle on the Ryobi RHV18 hand vacuum. Prints easily in PLA without supports.
I bought a Ryobi RHV18 after my 15+ year old Electrolux Ergorapido let the magic blue smoke out, and was a bit disappointed that the Ryobi didn't come with a brush nozzle attachment. So I designed this adapter to allow the Ergorapido brush nozzle with its rectangular opening to fit on the Ryobi's round nozzle.
I've included the Fusion file so if you need to modify it to fit something else you can.
The author marked this model as their own original creation.