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Message: <blockquote data-quote="DaveStebbins" data-source="post: 1140239" data-attributes="member: 1427">Well that's another point, the mold itself could induce some bias into the die. If the mold was not cut correctly or, more likely, if it wears unevenly over the course of many many heats, the actual shape of the die produced could vary, introducing some bias. In the end, given the regular shape of dice (all cross-sections through the center of a face are the same), it is unlikely that any measurable bias is introduced during cooling/shrinkage. I would expect more bias from mold wear. Given how much plastics compounds have advanced in the last two decades, I would expect them to be fairly hardy in most environments (even storage). Due to the regular shapes, I would not expect to see bias regularly introduced by cool-down shrinkage. Even mold wear should be caught by a regular preventive maintenance schedule. Outliers however, the occasional die which is not normal, can never be prevented. Also, given how often PM programs are more lip service than reality, I wouldn't be surprised to see biased dice made by worn molds. The only way to tell for sure is to run a test on your die and check whether your results fall within acceptable limits of "random." -DaveI remember altering a d20 to bias it on purpose once a long time ago, for giggles. I used it for one game session and was horrified at how amazingly well it rolled. Immediately after the game I destroyed it so I wouldn't be tempted to use it again.</blockquote>

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