If your model is made of wax, multiply by its weight by 22.00, then you'll have a good approximation of what your casting will weigh. To convert from pennyweight to grams, multiply (dtw) x (1.555) = your weight in grams. For Envisiontec models, multiply by 18.7 (instead of 22), and for Solidscape models, multiply by 15.7 (instead of 22). You may also calculate the volume of your CAD file; platinum's density factor (approx 22) applies. Actually the density factor is 21.4, but we say 22 because it's better to estimate slightly heavy due to sprue cuts and other factors.
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