11-10-2019, 12:43 AM
So, a while back when doing some printer maintenance and troubleshooting a banding issue, I had to remove the Z axis carriage/arm. One thing I noticed was that the bearing setup was way out of adjustment and extremely snug. So snug in fact, that you could feel it stretching the Z axis rail when it was put back into place (with the anti-backlash nut removed). Also, it took a little bit of force to move it by hand, it didn't move freely or drop under it's own weight.
So, I decided to tear it apart and yes, the roller bearing is adjustable
Needless to say, it takes a few attempts to get it just right. Needs to slide into the Z rail where it's slightly snug and a little tap gets it on, yet still will fall under its own weight. After doing this, then doing the usual leveling the build plate and running a test print, the banding issue was for the most part gone. I've also replaced the anti-backlash nut with a TR8x2 POM nut (available on Amazon - https://www.amazon.com/gp/product/B07RKXWDSG/)
So, I decided to tear it apart and yes, the roller bearing is adjustable
Needless to say, it takes a few attempts to get it just right. Needs to slide into the Z rail where it's slightly snug and a little tap gets it on, yet still will fall under its own weight. After doing this, then doing the usual leveling the build plate and running a test print, the banding issue was for the most part gone. I've also replaced the anti-backlash nut with a TR8x2 POM nut (available on Amazon - https://www.amazon.com/gp/product/B07RKXWDSG/)