I often struggle to get my exhaust hose on and off the glowforge exhaust port. I designed an extender and posted it to Thingiverse. It is meant to be printed in TPU. This adds another 10mm or so to the length of the exhaust port, while still allowing a 4" vent hose to fit on easily.
I couldn’t find anyone else that had designed one of these, so I went ahead. It’s a real simple design and I also put the source code (Open SCAD) on Thingiverse. I hope you find it useful!
Design is on Thingiverse here: