If you’ve followed Hackaday for a while, you might know that all ball screws don’t have threads. While ball screws are uncommon in 3D printers, they show up pretty often in CNC machine designs.

Eminent Spine earned FDA 510(k) clearance for its 3D-printed titanium pedicle screw system, according to a May 7 news release. The milestone makes it the first and only system of its kind to earn FDA ...