I am noticing an issue with our fairly new TAZ printer. The Z axis seems to be sticking or binding between the vertical smooth rod and white “fingery” bushings on the righthand side. The result is that as the Z height is changed, the righthand side of the Z gantry stays put for a short while after the motors start to move (the height change is taken up by the printed wave spring, which deforms slightly), then suddenly jumps up or down. The height after the jump is incorrect (some deflection still on the wavespring), causing the bed leveling to effectively be off from one run to the next. The (hysteresis / backlash / stiction) is always on the righthand side, regardless of the position of the extruder, so it doesn’t seem to be a weight / gravity issue.
The smooth rod is clean and free of debris, and there have only been a handful of prints done on this machine. The manual also warns not to apply lubricant. Is there an adjustment or other recommended means to fix this?