This has always happened with my machine when I tighten the x-axis belt. The belt ends up being pulled into the wood on the bearing side, and squeaks horrendously. print quality doesn't appear to be affected by this, or by slightly loosening the belt so that it no longer squeaks. I was wondering if anyone else has run into this issue, and if anyone has found a way to better center the belt within the extrusions. perhaps longer threaded bolts on the x-carriage?

i've included a photo.