Okay, so here's the thing that took me a while to figure out and THEY DON'T TELL YOU. See that round doo-dad I have circled in the picture? It rotates! It has to be lined up JUST RIGHT when you snap the extruder back onto the X carriage or else it won't attach or make a connection or work. It was SUPER-FRUSTRATING trying to get that sucker back on there. Talk about some poor engineering.

But...we're only getting started



One major change from the Rep 2 is the fan arrangement. There is only one fan, it appears to be the same squirrel cage fan that's used for the Rep 2. On the Rep 2 that's the one that blows into the duct which blows onto the build around the hot end. On the 5th Gen, they split the air flow so that some of it blows onto the build from either side of the hot end, and some of it goes to the area just above the hot end that's supposed to stay cool enough that filament can be pushed.