Models E3D Titan Extruder 488 8552 19 H-bot 3D printer 262 2850 10 OpenBuilds Various Hardware 247 4860 7 OpenBuilds V-Slot Gantry Set (all sizes) 230 8088 5 Open Builds V-Slot linear rails (all sizes and lengths) 123 2446 1 Hitec HS-422 29 1938 3