Short-to-ground on drivers
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Swapped the PSU (taken out a 30A/300W and temporarily replaced by a 17A/200W I had spare)
The Vin is stable in the new PSU (It was fluctuating in the old one) and a test print is running fine.
Thanks for the help diagnosing the issue (And the great customer support from think3dprint3d)
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Sorted.
A new 400W PSU has been installed and my short to ground errors appear to have vanished
DC, thanks for helping locate the issue and solve the problem.
