My guess is that the stuff was carbonized PLA. If you let PLA sit in the nozzle without extruding for even a few minutes at temps over 180C, it tends to turn into something like burnt sugar.
It wasn't really that much work - maybe spent 20 minutes over and above removing/reinstalling the printhead and nozzle.
While in the shower this morning, it occurred to me that if the drawings are available, I'd consider having a local high-grade machinist do a run of UM2 nozzles in several orifice sizes: maybe .35, .4, .5, and .65mm?
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jbeale 0
Thanks for that report, it is good to know things can be (laboriously) fixed.
>My UM2 has roughly 1000 hours of use now, printing both ABS and PLA
Is there any reason to suppose that if you print exclusively in one material, the gunk buildup inside the tip would be reduced? In any event, a ready supply of replacement nozzle assemblies would certainly be welcome.
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