>>41620
It seems to me I recall seeing at least one, yes. However a quick perusal of our
Doll thread didn't seem to turn it up. (cf.
>>28514 )
I don't think there should be any significant issues to doing it, save this: both the ball and the socket will need to have some type of high-qual coating & smoothing done on them to work properly.
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Alternatively, resin printing for these parts may be a possibility? Please let us know what you find out, Anon! Cheers. :^)