Houkr 5PCS Aluminum 20 Teeth GT2 Timing Belt Pulley 6mm Bore 6mm Width, Synchronous Wheel for 3D Printer Parts Width 6mm Timing Belt and M4 Wrench, for RepRap 3D Printer Prusa I3

Houkr 5PCS Aluminum 20 Teeth GT2 Timing Belt Pulley 6mm Bore 6mm Width, Synchronous Wheel for 3D Printer Parts Width 6mm Timing Belt and M4 Wrench, for RepRap 3D Printer Prusa I3

ReliaBot 2PCs 8mm x 300mm (.315 x 11.81 inches) Case Hardened Chrome Plated Linear Motion Rod Shaft Guide - Metric h8 Tolerance

SHKI 20 Pcs 608 2RS Ball Bearings – Bearing Steel and Double Rubber Sealed Miniature Deep Groove Ball Bearings (8mm x 22mm x 7mm) (608 2RS)