I’ve tried many of the suggestions to fix the extruder CM27xx errors. Here is what finally worked for me. I updated to the new firmware 1.1.2.6. I also had to tune my filament profile (using CR Black Hyper PETG) using @frankjoke 's instructions at Calibration of new (non CR preconfigured) filament - how to for K2. I also had to adjust my z-offset to +.1. After these 3 changes, I’ve successfully printed 3 full bed sized prints each taking over 14 hours. BTW, I’m using CR Print 5.x for Mac ARM. I would to thank everyone for all their input and suggestions for this issue,
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