Our Fuse Series SLS materials and the powder credit system are designed to ensure a smooth, reliable printing experience. Formlabs SLS printers, including the Fuse 1, Fuse 1+ 30W, and Fuse X1, use a powder credit system and the ID card that comes with each package of Formlabs powder ensure that only fully-tested materials are used with the printer and that you can track your powder inventory, even after reusing powder multiple times.