xy axes rock very loudly and rattle

[Mxbrnr]

I have studied this topic extensively. If you can actualy see the linear rail carriages wobbling during movement, espeically direction changes, and you can wiggle them by hand, then I can almost guarantee the u-groove bearings inside the linear rail modules are worn/defective. The older SM 2.0 standard A model machines have been notorious for this issue, and from what I have seen I would believe the newer T-suffix models are not any better since they use the same bearings in the exact same fashion. It is a major engineering design fault that SM has been noted as refusing to acknowledge for several years. Most users have resorted to DIY fixes by disassembling the rails to replace the bearings, and/or installing support rails and bracing mods to eliminate it from happening again.

There is some useful information about the bed frame and heated bed that you can read about here:

Bed Leveling - Revisited & Detailed

Intro Lots of people have had issues with the bed levelling for 3D printing on the Snapmaker 2.0, most specifically with the 350-series model machines. Being the most popular size of the SM2 machines, as well as having the largest build volume lends to more places and occurrences of the issues appearing, so to a certain degree that is to be expected. Nearly as many people have their suggestions for how to improve it. Out of curiosity, I wanted to know just how much difference these various reco…

Specifically:

@Mxbrnr

The Main Issue
Most 350-series machines have a bed level delta (variance between the highest and lowest points) in the 0.5 to 0.4mm range in a cold/un-heated condition. With heating, that can jump to over 1.0mm. As many of us have seen, even a delta of 0.4 can sometimes be too much for the machine firmware and software to compensate for, thus causing issues with the quality and success of 3D prints.

Platform Issues
Per Snapmaker Support, the stock v2 (updated) “Platform” (also known as the “bed frame”) itself has a manufacturing flatness tolerance of 0.15mm across all of the screw down points, so you can expect at least that much bed level variance before even installing the platform on the machine (I have not learned what the tolerance is for the older v1 frame). Some platforms will have less, but if it has more, Support considers it an unacceptable out-of-tolerance manufacturing defect, and you can contact them for a replacement. To help you picture this tolerance, human hair thickness is between 0.017 to 0.181mm, with most being in the 0.05 to 0.09 range.