Nema 14 Stepper Motor Bipolar 23Ncm(32.6oz.in) 0.5A 42mm 4-wire DIY 3D Printer 705701878759 | eBay
Ball Screw Linear Stepper Motor Actuators - NEMA 14 with 8X12 Ball Screw - Flanged Nut - Ball Screw Stepper Motors Linear Actuators | Acme Screw, Lead Screws, linear actuators, hybrid stepper actuators | Helix Linear Technologies