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Apparently if you add a small sinewave signal on top of your low voltage dc you get a better coating. I've also read that stirring your fluid (with a pump or something) helps to keep fresh metal solution washing over the part and leads to a better coat. I've been looking at doing some similar things with 3d prints and have only read up on it so far, no actual experience. It seems you want a slow, even coat to build up rather than a thick one all at once.