Tevo Tarantula Ultimate 3 carriages bed support

thingiverse

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 developed and submitted a first bed support. You can find it on Thingiverse at https://www.thingiverse.com/thing:2810808. Although it improves leveling, it still has a major flaw - the huge overhang 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 directions, whereas the wheelbase is only about 100mm. Therefore, I thought for a solution and came 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 three small carriages that are independent 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 three times (main block, setting block, bull gear, thumb wheel) and the structure components two times (leg, jack block, jack wedge, jack top). You will also need to procure the following parts: - 2 twenty-by-twenty-by-five-hundred-millimeter rails - 2 M3x30 bolts for the jack - Nine M5x35 bolts for the wheels - Six M4x30 bolts for the setting blocks - Three M4x20 bolts for the thumb wheels - Four millimeter washers to put below the bull gears and the thumb wheels for easier rotation. - Three M4x35-45 (length of your choice) bolts for the bed leveling - Four M4x25 bolts for the jacks - Twelve M4x10 screws with T-nuts - Two 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 two different types of jack top elements (with two lateral screws or with one bottom screw)