There has got to be a better way to change material. I can't imaging having to dis assemble the nozzle assembly every time I change from ABS to PLA.
Had exactly the same issues. I only print ABS now, I never mix materials any more. Will maybe buy a second UM2 for PLA.
Exactly where was the hardened ABS ring? At the bottom of the PTFE (inside) or below it (at the metal hot end isolator, the part with holes around it?)
Also, did you do the atomic with ABS or PLA and at what temperature?
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