ABS does not cook in the nozzle - it's PLA that breaks down and turns to brownish stuff like crystalized sugar if you leave it in a hot nozzle.
That said, when I change from ABS to PLA, in the future, I will definitely use the nuclear option to get as much ABS as possible out of the nozzle.
BTW, is there any long-term risk in doing the nuclear cleaning? I've had to do this repeatedly to get clean extrusion without slowdowns.
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leon-grossman 0
I'm back for a status update.
I didn't expect this problem since I swap between ABS and PLA on my home printer all the time. As a result, it never occurred to me that it could be material remaining in the nozzle that was my primary problem. My clue came when I noticed that t-glas print on my home printer had a dark shading on the bottom half due to residual black ABS in the nozzle.
Since that discovery, I just let the PLA feed through the nozzle for about a minute after ABS to PLA material change on my UM2 and I haven't had clogging issues since.
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