Like suggested above, the best option is going to be metal plating. Copper and nickel is standard. Try Repliform or SAT plating. Once you have nickel you can do gold to get the most mass per thickness. It depends on the wall thickness of the part you are making when it comes to additives. Typical % are like 20%? Seems like a lot but easy enough to try if you can acquire the barium sulfate.
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