I replaced the included bendy, flimsy, dryer hose with a stiffer one with white plastic screw on ends. Commonly available at ACE hardware and the like (not at OSH, for some reason) for less than $20.
It resulted in a MASSIVE improvement to fume removal during cutting. As in, my garage took on a distinct campfire smell over the course of a cut whereas there is zero smell now, even after 2 hours of heavy engraving.
To join the plastic end to the GF, I used a bit of sticky backed high heat gasket (used to repair Big Green Eggs, coincidentally). That produces a fit that is almost tight enough to stick on its own. Not quite. Had to use some gaffers tape to hold it in place. The gasket produces an airtight seal, though.
So, for support:
(1) The included hose is really sub-optimal. Unless you have a dead straight run and/or support the bends, the hose sags, creating more air drag. And the interior is basically a spiral sawtooth, which blocks more air flow. A better solution would be welcome.
(2) The flange out the back of the GF for attaching hoses is a pain to use. A pain to use with the included hose as the clamps are hard to get around the spirals and the whole thing is hard to stick on the back of the machine. And a pain to use with any other standard dryer attachment as it is really really short.
Suggestion: I get why it only sticks out as much as it does. How about some conveniently placed bits of steel or super magnets in the case that could be used for magnetic coupling purposes? Then, maybe, you could also sell a couple of different styles of hose couplers in the Glowforge store?