Models E3D Titan Extruder 476 8140 19 H-bot 3D printer 258 2738 10 OpenBuilds Various Hardware 230 4338 7 OpenBuilds V-Slot Gantry Set (all sizes) 200 6280 6 Open Builds V-Slot linear rails (all sizes and lengths) 114 2293 1 Hitec HS-422 28 1871 3