Btw.: I think I never mentioned how clever I think this steel band is! I had a few reservations as to how long-term stable this would prove, but I’ve only seen one failure yet on Facebook, so I suppose it’s long-lived. Great work!
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I would never use the term “dust-proof” with them though.
That would imply that no dust gets through and that’s definitely not the case. When I had to adjust the play in my x-axis there was definitely some dust in there. They do a good job though and better than I expected.
I’ve now had my machine for almost a year. I’m about due to do some preventative maintenance and cleaning and lubrication. I’ll report back what I find inside at this point.
-S
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I’ve since added Bellows when doing CNC. Though I accidentally broke one because I forgot i placed it in my chair and sat on it when I took them off last, so they’re off for now. I’ll post pictures when I get around to fixing the one I broke.
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After checking our machines in the testing room, we do not find dust inside the rails. I will keep my eyes on this thread.
Edwin
Hi Mr Echo, I also have Y axis bump issue. It’s about 1 year old and the hotbed visibly see-saws. The carriage bearings have worn, perhaps prematurely, which causes the hotbed assy to see-saw.
I was thinking about swapping the carriage bearings for those in the (perhaps less critical) Z axis. Just wondered if anyone has done this? Did it work as a temporary fix until new new axis modules arrive.
Adding the sbr16 rails will fix this issue once and for all.
I don’t think you have buy a new rail, unles you are getting it through warranty 
In the GitHub - shurushetr/awesome-snapmaker: Curated list of things that help you make something awesome with Snapmaker machines.
Check out the “how to fix stuff” and “aftermarket parts” sections, you’ll find the bearings and the plastic nut replacement.
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Also, check through the forum - there are several guides linked how to repair the bearings, the nuts and how to adjust them. There’s also an official Snapmaker video how to maintain the mechanics of the linear modules.
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Thanks nweolu, that’s exactly what I had in mind for a more permanent fix. Appreciate the heads-up - Stu
Thanks Hauke, I ended up swapping the y and z module bearings over as a temporary solution. The rail guides are the way to go. Appreciate the heads-up - Stu