ProtoCAM (also known as Belknap Holdings) is a company that provides additive manufacturing and prototyping solutions. Its services include stereolithography (SLA), selective laser sintering (SLS), 3D printing, urethane casting, fused deposition modeling, metal prototyping, and finishing. The company caters to the defense and aerospace, automotive, medical, industrial, toys, 3D architecture models, and consumer goods industries.