Triple Z Bed Levelling for Cube-Style Printers

prusaprinters

With two steppers on the same driver you constantly have to worry about the steppers falling out of sync when unpowered.  If you link them then things get a little better but you're in a big mess if you do skip a step or pull over a cable tooth.  Dual independent steppers can auto-level along the X axis but you still have to account for Y axis adjustment manually.  With triple independent Z steppers tilt adjustment can automatically level your bed in both X and Y automatically.This design assumes you already have four smooth rods and two threaded rods that are typical in a two motor setup.  We'll reuse those and add another couple rods, stepper, and maybe some mounting hardware to come up with a straightforward and reasonably cost-effective triple-Z setup.Check out a video on the setup here: What you'll need:Five 8mm linear rods/bearings/clamps (your printer probably already has four):Rods: https://amzn.to/3NKMY6kBearings: https://amzn.to/3ztbCnEClamps (x2): https://amzn.to/3Hhhm5GThree 8mm threaded rods/bearings (your printer probably already has two):Rods (w/Nut): https://amzn.to/3NKu9QLPillow Bearings: https://amzn.to/3mELiPRThree stepper motors: https://amzn.to/3MMx8H1Three 8mm timing pulleys: https://amzn.to/39jLilgThree 5mm timing pulleys: https://amzn.to/3xJRY5pThree 200mm x 6mm GT2 loops: https://amzn.to/3NQ4YfuThree 10mm threaded steel balls: https://amzn.to/3ty026KThree round countersunk magnets: https://amzn.to/3QkNjhuAnd then you'll need an assortment of m5 bolts and boat nuts, an m4 bolt for the threaded balls, and a 2020 90 degree angle of some kind for the bed.For the basic setup you'll need to print:1x Double Bed Mount - Short (or long depending on your bed platform size1x Double Bottom Mount1x Double Top Mount1x Triple Bed Mount - Left1x Triple Top Mount - Left1x Triple Bottom Mount - Left1x Triple Bed Mount - Right1x Triple Top Mount - Right1x Triple Bottom Mount - Right3x Cap Magnet Mount (or Straight/Corner mount if you are building a square bed frame)