Models E3D Titan Extruder 488 8542 19 H-bot 3D printer 262 2847 10 OpenBuilds Various Hardware 247 4853 7 OpenBuilds V-Slot Gantry Set (all sizes) 229 8047 5 Open Builds V-Slot linear rails (all sizes and lengths) 123 2441 1 Hitec HS-422 29 1935 3