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This is what happens if you try to extrude when an XCR NV6 hot end is too cold while using a geared extruder (attached).

The filament bunched up inside the funnel section of the teflon throat and broke off when the extruder attempted a retract. Must have happened during a failed print last night - was wondering why I couldn't extrude anything this morning.

Clearly Marlin's #define EXTRUDE_MINTEMP 170 is too low and I need to up it to 185 or so. :)