Small Y-Axis movement on X-Axis direction change

Printer is an enclosed V-Core 3.1 500

I have an issue where there is a slight movement on the Y axis whenever toolhead changes direction on the X axis. Here's a video: https://photos.app.goo.gl/8qVE11bfJn74yuMT9

  • Y moves on the first X movement in a the opposite direction of the last
  • Y does NOT move on subsequent X movements in the same direction
  • I cannot see or feel any erroneous X axis movement when I move the Y axis in either direction
  • The entire gantry moves when this happens; it's not erroneous Y movement only on one side, it looks to be uniform.
I've played with a variety of belt tensions, it never seemed to makes things better or worse.

Gantry is not racked; both ends of the X axis hit the frame at the same time.

It looks like the belt paths through the motor mounts (I'm using FMMM) are good. Belts are in good condition, no fraying.

I will say that I believe this was not always happening. I noticed it yesterday after my Euclid started to fail to dock/undock reliably, but it was working reliably for a good while before that.
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