So although my BigBox is generally working well, while trying to fine tune my extrusion multiplier I noticed some very small artefacts in the Y axis, this manifests as very slightly misaligned bands at certain layers of the print. It's not axis shifting as such as it usually corrects itself within a few layers, just the walls are not perfectly aligned, and only in the Y axis. I've printed the same model in different parts of the bed and the same thing happens, and it's usually at a different height as well. I've double checked all the pulleys and belts are tight, the rods and bearings are greased, and the stepper voltage is set correctly, but it was still happening. So I decided to go through the whole Y axis commissioning steps again, and one thing is that my Y axis, even with everything slackened off, does not move as freely as it does in the video in the build manual. It feels evenly smooth with no binding or rough or lumpy spots, but there is definitely much more resistance to moving it manually than there appears to be in Greg's video. Any suggestions for other things I could check or ways to try to get it moving more freely?