Binder Jetting Metal binder jet processing (BJP) is a form of 3D printing that uses fine droplets of binder to hold metal powder together. The binding agent is precisely deposited on the powder bed to form each layer of the part. In some cases, such as sand 3D printing, the printed piece is considered complete. But for metals, the as-printed shapes are considered “green” parts. A sintering step is necessary to fuse the powder together into a dense metal part. Binder jetting has the advantage of being a “cold” 3D printing process, which avoids creating residual stresses in the parts and eliminates the need for support structures. Parts can be stacked in the Z axis as well as the X-Y orientation, making it possible to print many parts at once and sinter them in large batches.