End-of-Filament Sensor An end-of-filament sensor is a device that detects when a spool of filament is about to run out or has already been depleted. This sensor halts the printer’s operations when no filament is present, preventing incomplete prints. It is particularly valuable for large or long-duration prints where running out of filament mid-print would result in wasted material and time. The sensor can take various forms, such as optical or mechanical, and is often integrated into the extruder or filament feed path. When the filament runs out, the printer may pause the job, allowing the user to reload the material and resume printing without starting over. |