I think for now, I've went as far as I want to improve the wiring- mainly shielding, replacing cables and repositioning components.

My next area that I'm going to look at is the flexing of the unsupported x-axis 20mm linear bearing shafts. They can be flexed, tilting the spindle back and forth on the y axis direction. With decent pressure on top and bottom of spindle, I can deflect it by as much as 1.5mm (estimate) either way.

I knew about this design weakness BEFORE I purchased the mill, knowing that I may need to address it. No big deal- I'm having fun!

I have some ideas to mitigate the effect and later to help cure it.