One of the bed linear bearings (y axis?) is failing on one of my printers. It makes a bad grinding noise, and leaving dark streaks on the steel rod. So for now I've stopped using it because I don't want to mar the rod. Anycubic customer service is great and they are sending me new parts.
But, I also looked into getting the Igus polymer bearings, and seeing a lot of mixed reviews. Have any of you guys used the Igus bearings on your printer? Success? Too much play? I'd like to try them out because the linear ball bearings are noisy and sound kinda gritty.