I am troubleshooting lost steps on a cheap CNC conversion.
My setup is:
I use a set of steppers and PSU from a known seller of kits for Seig X2 mill conversions.
I also use a Gecko G540 driver and UCCNC UC100 motion controller. The G540 is is bolted to the back plane but no grounding wire to the back plane.
The PSU is grounded to the back plane and bolted to the back plane. The mains are grounded to the back plane.
The above are in a 20"x 15" x 10" steel enclosure.

I am trying to track down my lost steps, which I know can be a rabbit hole, so as part of the process I have a couple of questions:
- If the G540 and UC100 controller were within about 1.5" to 2" of the PSU, could that be considered too close and a source of problems?
(NOTE: I have moved if the G540 and UC100 about 6" apart and am now testing)

- Would it help to build some sort of Faraday cage around the PSU? Using metal window screening?