This is a glowforge exhaust vent adapter for a 6" hose. I used this when attaching my AC Infinity S6 inline fan to my glowforge. The printed piece should press fit nicely onto the glowforge exhaust outlet, however there is also a recessed area that allows you to firmly tighten it on with a hose clamp. The hose will fit on pretty tight, so you may want to modify the 6" diameter slightly. I provided the STEP files.

I also provided a flange for a 6" hose. It is the same diameter as the adapter.

I printed both at 0.25 mm layer height without any supports.