So after seeing this thread referenced on another thread, and after having just spent an hour cleaning my GF, I’ll add this to the monthly chore (ordered the camera - that will come in handy for a LOT of other things!).
But it makes me think about a few things.
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Design - This seems like poor design to me if it’s a part that may affect how the unit runs / performs. Certainly GF doesn’t want people shipping back their units for a busted fan from build up. Why not just make the exhaust ring on the back removable to get at the fan easier? Granted the Basic users can get to theirs, the Pro users (myself included) should have a way to get at the fan to get it clean or easily replaced. I get the case has the duct molded in, but this seems like a poor design.
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Design again - WTF is up with all of the wires / connections / stuff that other build up is affecting?!?! That should at the very least be shielded from debris hitting it with a simple piece of plastic. Granted not everything would be protected, at least it’d save it from SOME debris buildup.
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Cleaning technique - thanks Jules for outlining this. You’d think on some level GF would want to cover this, but yes it’s pretty dicey getting in there and doing this so not something the average user would do. I’m the kind of guy who rips apart appliances, washers / dryers, to fix / clean stuff so I’m not afraid, but you’d think they’d want to make this easier?
Kind of a rant, I just don’t want Zippy breaking down. And now something ELSE to do other than cutting / engraving. 
EDIT - didn’t see this thread:
Should have put my comments there!