Tevo Tarantula Ultimate 3 carriages bed support

cults3d

Why 3 carriages? At the beginning of the month, as I wasn't pleased by the original Tevo design (4 wheels, 4 points leveling), I have developped and submitted a first bed support (https://www.thingiverse.com/thing:2810808) Even though it improves leveling, it still has a major flaw : the huge ovehang of the arms from the wheels. I couldn't imagine any simple and cheap solution to overcome the fact, that the arms need to extend 210mm from each other in both direction, whereas the wheelbase is only about 100mm... Therefore, I have thought a bit for a solution and have come to this conclusion : if you want a very stiff design, you need to get rid of the bed support itself and directly support your bed with 3 small carriages, independant from each other. I think it will be a pretty stable design, without needing to buy an aluminum bed support. You'll need to build the carriage components 3 times (main block, setting block, bull gear, thumb wheel) and the structure components 2 times (leg, jack block, jack wedge, jack top). You wiil need to procure the following parts : - 2 20x20x500mm rails - 2 M3x30 bolts for the jack - 9 M5x35 bolts for the wheels - 6 M4x30 bolts for the setting blocks - 3 M4x20 bolts for the thumb wheels - 4mm washers tu put below the bull gears and the thumb wheels for easier rotation. - 3 M4x35-45 (length of your choice) bolts for the bed leveling - 4 M4x25 bolts for the jacks - 12 M4x10 screws with T-nuts - 2 corners for attachment to the main structure You may have to adjust screw lengths depending on your assembly v1.1 : adding functional clearance to parts missing it. v1.2 : proposing 2 different types of jack top elements ( with 2 lateral screws or with 1 bottom screw)