I’ve got a roll of Blue Geeetech ABS+ that starts to smoke when it’s still so cold that its layer adhesion is terrible, and just burns in the nozzle whenever it’s not actively extruding if the temperature is high enough that it sticks to itself. Obviously, this is bad, and it sooted up a nozzle so badly that it needed to be replaced before I gave up on it.
So far, the only ideas I’ve had are just to leave it on a shelf indefinitely or to landfill it, neither of which are a great use of nearly a kilo of plastic.
When it’s hot, it stinks of hot ABS, and it dissolves in acetone. I’ve read that sometimes budget filament manufacturers will use the same pigment across their whole material range, even if it’s not capable of withstanding the print temperatures of some of them, but it’s ABS+ rather than pure ABS, so it could be full of mystery additives that don’t handle heat well, too.
There’s not much point using it as glue as I’m not going to get through a whole kilo worth of ABS glue, and produce more than enough ABS scraps from test prints and support to always make a colour-matched glue anyway.