4Max pro 2.0 Anti-Backlash Fix

prusaprinters

<p>One part is based on this <a href="https://www.thingiverse.com/thing:5198158">https://www.thingiverse.com/thing:5198158</a> but i found it too much rigid to work properly, and it gives some movement impediment.</p> <p>The 4Max Pro 2.0 has a problem in Z axis. It results in imprecisions during small movements like 0.1 or 0.05. Using a mesh bed levelling or printing at 0.1 or 0.12 is a pain and the results will be like a russian roulette. Sometimes it works, sometimes you will find layer skipped in the Z axis.</p> <p>The Anti Backlash spring is not adequate to compensate the axial force caused by the heated bed.</p> <p>I tried various solution, like using another t8 (in POM) , changing the spring with a more rigid one. All this things helped a bit, but occasionally the problem appeared again, so none of these weren't a definitive solution.</p> <p>So i tried to add a "springy" piece of TPU to the Spacer used in the mod i linked before.</p> <p>Finally this semi-rigid solution worked perfectly and solved the problem.</p> <p>You will need to print the Spacer in ABS, with 25% or more infill and at last 2 perimeters o 3. The TPU antibacklash should be print with 20% infill, no more, 1 or 2 perimeters max, and 3 or 4 solid infill in both inferior and superior faces. 95A or 92A for tpu would be perfect.</p> <p>Hardware needed : 2 x m3 self-locking nuts and 2 x m3 10mm/12mm bolts.</p> <p>For assembly it, you will need to disassembly the z axis, put the Spacer ABS part between the 2 pieces of the nut and the spring (Look the image).</p> <p>The part in TPU could be added even after the assembly due to opened design. Use the bolts to couple the ABS part and the TPU part.</p> <p>Use the bolts to find the righ tension you need, don't tighten them at will.</p> <p>Hope this helps for your happy printing :D</p> Category: 3D Printer Parts