With the cube that looks more like a poor cooling issue to me... I had results similar to but worse than that when I first assembled and ran the unit without any fan installed. Is your fan on?
Is the squirtle supposed to look that way?
I'd jack up the pots a bit to get that test out of the way. If squirtle were facing forward or backward while printing, increase your Y pot.
If facing sideways, increase X pot.
Test the adjustments with the t-nut.
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