sethcluett

Hello, so I have a doozy of a first post: tl;dr: look at the photo - how do i get this hardened ABS off the print head? Over the weekend, without asking, a student replaced the filament on our S5 from Ultimaker Branded PLA to a generic ABS he found. I arrived Monday morning to discover the horror show in the attached photo: Hardened red ABS had popped open the print head and the build-up caused the x-y limit switch error, since it can't reach the corner. The ABS does not want to release from the print head. My instinct was to heat up the extruders and pull the abs loose, but the chunk facing the rear of the machine won't let the print head start-up calibration run, so i can't get past the error to head up the extruder. what i've done: I have been careful to not use too much physical force, but what i have done hasn't worked. I started to use an x-acto knife to remove the chunk that is preventing start-up, then thought I'd reach out to the forums and ask about best practices here. Would acetone work? Am I right to think a heat gun would risk melting the print head enclosure plastic? Any advice or war stories welcome. Thank you.