[V2.0] Adjustable Y-Axis Bearing Holder for MK3 - Fix That Rattle!

prusaprinters

<p><strong>Version 2.0 Update</strong></p><p>It became clear that overtightening the holder on the lateral adjustment screws can cause the bearing holder to crack. While this did not seem to affect print quality, it's not a good thing to have a cracked bearing holder.</p><p>I released an updated, thicker model. With version 2.0, there is about 0.5mm clearance between the frame and the holder, so <strong>be sure to measure your print</strong> so that it matches the dimensions of the STL. &nbsp;</p><p>----</p><p>My Y-axis for my MK3S+ is/was <strong>ALWAYS </strong>rattling. No matter how many times I replace the bearings or re-grease it with any kind of grease imaginable, it always rattled. Drives me absolutely nuts to listen to.</p><p>The rattle itself is due to the balls inside the linear bearings rattling against themselves and the rod. The y-axis then amplifies the sound like a speaker.</p><p>I've tried everything I can think of to fix it, but ultimately I think it's just a design flaw of the printer. The LM8UU-type bearings that are used throughout the printer are generally designed to be compressed into a sleeve. This preloads them onto the rod they are gliding against, reducing the overall clearance. And thus, the reducing the amount of rattle.</p><p>But the standard bearing holders do not provide nearly enough compression force to prevent the rattle. I believe the old U-bolt type holders would sort of “bend” the bearing a bit and apply a bit of compressive force. Which is why most of the reports of rattling have come up after the introduction of the newer bracket-type holder.</p><p>To get around this, I designed this bearing holder with 4 holes for screws. The screws can be tightened against the bearing itself, apply compressive force in 4 separate locations. The screws can be adjusted (tightened or loosened) as needed, or you can ignore them entirely. But if you're finding your y-axis rattling all the time, give these a try, and tighten the adjustment screws bit-by-bit until the rattling goes away.</p><p><strong>Parts (For Each Holder)</strong></p><ul><li>4x screws (not too long)</li><li>4x square M3 nuts (~1.8mm thickness, same kind the MK3 kit comes with).</li><li>2x 18mm M3 screws (to attach the holder to the y-axis carriage).</li></ul><p>&nbsp;</p><p>&nbsp;</p>