Hi Shayne,
Here's a FREE Mass Calculator Plug-in for Rhino that works quite well.
http://www.rhino3d.e-cnc.com/masscalc/masscalc.htm
It has a good selection of the various Precious Metal Alloys we use & even some we don't. ;)
Just be aware that your model or items for calculation need to be a solid.
HTH, Colin
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