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This article first appeared in Make: Volume 41.

This article first appeared in Make: Volume 41.

In the past few years we’ve seen huge advancements in desktop 3D printing. At home, at your local hackerspace, or even your community library, you can design and print an endless variety of items and customize them to your individual needs.

Where desktop 3D printers fall down, though, is in creating large numbers of the same thing. 3D printers tend to be slow and error prone. One way to quickly manufacture your parts 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, lightweight parts using just a quarter of the resin. In this project you’ll use a 3D printer and a few basic tools to produce your own lightweight rotocaster for a fraction of the cost of a commercial unit.

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