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Not in a 3 phase system. You're thinking of the center tap of a regular household single phase system. In 3 phase, each phase is offset from the next by 120 electrical degrees, so current is actually supposed to flow between A and B, B and C and C and A. If the system is operating correctly, there really shouldn't be any current in the ground at all. Failing that, what you're describing is a grounded wye system, there is also a delta, which has no connection to ground. It has it's own unique characteristics as it can 'float' to some offset potential if things aren't correct.
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You can always use that almond liquor in coffee or other iced drinks. If you like a good Martini, try equal portions of khalua (or some other coffee liquor), your almond stuff (or frangelico, what I used) and pinnacle whipped vodka, or just a good clean neutral flavored vodka. Shake all three over ice, and serve in a chilled martini glass. Warning, it packs a punch.
Are you sure the arm supporting the work isn't deforming when it moves down through the resin? I noticed the hollow objects aren't square, but skewed which makes me think this is a mechanical problem. Make sure the bed moves smoothly and clean, any misalignment of the bed or movement will be transmitted into the object being printed.
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