The 3DP, a 3D-printed leadscrew-nut insert prototype service, allows machine builders to verify linear-motion design iterations quickly and accurately. The inserts have a threaded interior (with a high-efficiency thread form) and a hex-shaped exterior to embed into flanged nut bodies or into more-complex 3D-printed prototype assemblies. In addition to the hex shape, which locks the insert into the nut body or assembly radially, each insert also includes a ring groove that (with adhesive) locks it axially into place. The nuts support OEMs that use additive manufacturing for short lead times. These nuts are made of advanced materials that are engineered explicitly for production-part performance.