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Molding a small, tubular object. Ideas? Answered

Hi! Thanks so much for a fantastic instructable class. Very well written and excellently illustrated!

I am currently sculpting a 10" BJD (ball-jointed doll), and plan to cast the 3D printed parts in resin. I've been wracking my brain on the best technique to cast the pieces though, on account of them being so small and hollow. Do you have any thoughts as to how I could best approach something as complex as that? Things like the forearms and legs in particular seem like they'd be really tricky with a 2-part mold.

Thanks again for your course and your insight!