I got
this skull made by 3B. It's expensive, but seems to have very accurate proportions. The price compels me to draw it often, too.
The jaw is removable, and is held in place with a spring. The spring on my model does not retain its shape, though. Once stretched, it may stay that way! I think it was only intended to keep the jaw in place, and it works very well for that.
Really, I think it should be possible to find some public-domain or CC licensed 3D data taken from medical scans and convert that into something printable from
shapeways.
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