But at least right now, you generally pass most of the regs by isolating the heck out of the low voltage side and leave it floating. For some applications and in some jurisdictions (eg, low voltage lighting in the US) it is *required* to be floating.
Expansion/contraction sounds a bit weird as a cause of electrical potentials. How about it being the liquid plastic acting sort of like a Van de Graaff generator as it passes through the nozzle?
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I think what's actually happening there is the heating/cooling warping pulling the plastic up from the bed slightly in bursts. Certainly, popping a thin PETG part free with tweezers is a sure-fire way to bork the display/spontaneously reset the printer.
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Hmm. That could be already-charged plastic suddenly moving and generating a change in electric fields, or it could be plastic picking up a charge as it detatched.
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