I fought layer shifting for quite some time, mine was caused by a mixture of speed/acceleration and my belt tensioners, what axis is this happening on? what type of tensioner do you have on said axis? Is your speed/acceleration set too high?
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1 month later
I had the same concern recently.
I found on mine that the one washer diameter was not big enough on the ho. See the attached picture. The red circled washer was where I had a concern. You will see that the centre piece that rests on the washers is very close to the edge of the washer circled in red. This is not the case on the for the black circled washer.
What I found happens is that the centre piece holding the hot end might slip down past the washer and this caused the shifts in layers for me.
I ended up screwing another washing in under the washer that is already there to make sure that the centre piece can’t slip by the washer. This is a interim fix (There is a possibility that this additional washer can come loose and fall out) and I will get a washer with a bigger diameter to ensure that this won’t happen again.
I hope that this helps.
4 months later
I found that aligning my tension pulley with the gear on the stepper so they were parallel fixed the layer shift problem for me.