Voron 12mm Y rod upgrades

thingiverse

Voron upgrades its 12mm Y-rod system, significantly reducing deflection for larger builds by leveraging the fact that Y-rods don't move much during printing operations. Increasing the size of the X-rod also becomes an option, but doing so greatly increases moving mass which can be detrimental to performance. A few millimeters are lost in both the X and Y axes due to the larger bearing size used in this upgrade (the exact amount varies depending on the specific frame design). My own oversized frame doesn't provide a precise measurement, but it's likely around the difference between an LM8LUU and an LM12LUU. BOM changes include: - Longer 4mm Y-shaft retainer screws (using 4x M3 20mm screws) - Upgrading from 2x LM8LUU to 2x LM12LUU - Swapping out 2x 8mm shafts for 2x 12mm shafts The V075 build was retrofitted and is currently using this modification. Printing settings remain the same as other Voron 1.5 XY configurations: four perimeters, five top/bottom layers, a 0.2 layer height, and a 0.4 nozzle size. Known issues with this upgrade include: - The B idler assembly has a mirrored configuration compared to the A assembly, which flips the upper and lower belt positions. This might affect symmetry but doesn't impact function. - There's minimal clearance between the thicker bearing retainers and the Z shaft support. My own build works fine, but you may need a small amount of plastic to ensure proper alignment. The screw added to the rod retainer is untested, and the hole in the motor mount will likely require enlargement for minor adjustments to the rod position. The heavier rods are slightly harder to adjust, but I found that the added leverage from the plastic was sufficient.