Tevo Tornado - belt-driven 2-nd Z-rod with minimal parts

thingiverse

### WARNING ### This mod reduces max print height by 4..6 mm. To install this mod, follow these steps: #### Part 1 - Removing Original Coupler and Installing New Pillow Block Bearings Remove the original coupler from the motor side. Install new pillow block bearings on both sides of the X-axis assembly. Make sure they are securely tightened to the X-axis frame. #### Part 2 - Installing Z-Rods with Pillow-Block Bearings and Pulleys Install the first Z-rod on the motor side, making sure it is suspended by a set-screw from the pillow-block bearing on top. Install the second Z-rod on the non-motor side, also suspended by a set-screw from the pillow-block bearing on top. #### Part 3 - Installing Belt and Pulleys Hook the closed loop 784T GT2 belt onto the pulleys and stretch them apart to measure the distance between the rods. Shift the second Z-pillow block bearing so that the distance between rods is 3..5 mm longer than what the stretched-belt ruler shows. #### Part 4 - Final Assembly and Testing Re-align both Z-rods vertically, making sure they are level and perpendicular to each other. Install the pulleys with belt on the Z-rods, hooking the belt over them and stretching them apart until they rest on the pillow-block bearings. Tighten-up the set screws on the motor-side only, leaving another side loose. Use a square ruler to make sure that the alu extrusion of the X-axis assembly is perpendicular to both vertical alu extrusions of the Z-assembly. Rotate the second Z-rod to adjust the X-axis angle relatively to vertical extrusions. When set perfectly square, tighten-up the set screws of the 40T pulley on the second Z-rod. Level the bed and run a test print!