Very practical filament detection sensor module, ideal accessories for 3D printer, making your printing work smooth and relieved. For checking the filament is whether run out or not, it automatically stops the 3D Printer when the filament runs out. Newly designed smart module, The main board executes the pause command operation when the filament is run out. A wear-resistant copper sleeve is added to the feed port and the discharge port at the same time can effectively prolong the service life of the product.