My fairly new TAZ 5 seems to have developed a looseness in the 3 bushings that support the X axis / extruder carriage. I am pretty sure this is then causing a wobble in the vertical surfaces of my prints. Although, I suppose could be something else, like a Z-axis screw being bent or binding. But the slop is pretty severe, maybe 1mm or so, which seems like it could cause all sorts of unevenness in prints.
I have a couple of sample octopus prints: the ivory one was the test print shipped with my printer. The white one is a recent print, slightly larger, where you can see the bands. (sorry for the blur).
I have the habit of pushing new filament through the extruder by hand to flush out the old color. I wonder if that has put too much force on the bushings and caused them to become loose.