A bd_pressure that does not answer used to be reported as "pressure skipped" and the purge passed unchecked. It now fails the check, so in enforce mode the printer pauses (and a resume purge stays paused). PURGE_CHECK_IGNORE_SENSOR lets purges pass without the sensor until the print ends; _PRINT_CLEANUP clears it so the next print checks again. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>