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Ultimaker 2 Extended neither extrudes or retracts material #185
Ran the nozzle up to 240 deg C, and let the heat soak in for a few minutes, and could then retract the material far enough (using the "Move material" menu) to pull it out and do a cold pull to clean things a bit.
The feed gear had chewed through the plastic enough to cause a point where it would stop feeding, so cut it off below that and fed in fresh plastic for it. Seems to be up and printing okay again now.