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Make: Technology on Your Time Volume 41 by Mark Frauenfelder

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DIY Rotocaster

Written by Matt Stultz

Rotocasting is how the pros make hollow plastic parts — and it’s easy to do at home.

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Jeffrey Braverman

With a 3D printer you can design and print an endless variety of items and customize them to your needs. But where desktop 3D printers fall down is in making large numbers of the same thing. They tend to be slow and error prone.

One way to quickly manufacture plastic parts in quantity is traditional casting: making molds and pouring resin. But resin can be expensive, and this technique only makes solid models.

That’s where rotocasting saves the day. By slowly spinning your mold, you can produce hollow, ...

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