@franklin brought me a printer that was exhibiting high x backlash to investigate.
I noticed the tool head seemed to struggle when actuating, and seemed like something was off as it looked kind of crooked.
I took apart the tool head and found that the bottom plate was installed upside down. this causes the rods to be shifted at an angle and will cause binding or high drag on the actuators.
You can clearly see the edges are not flush
The filleted side should be facing the bottom of the tool head, this one is upside down
The edges are flush when installed correctly
The filleted side is facing the bottom of the tool head when installed correctly
I imagine some machines might have been shipped like this, so we may want to put some checks in place.