Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Customizable Flex Joint Mold

by daprice, published

Customizable Flex Joint Mold by daprice Jun 23, 2014


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Printable mold for flex joints of customizable size, including those for Gyrobot's Flexy-Hand. We are currently experimenting with Smooth-On's "Dragon Skin" silicone but other materials may also be viable. Up-to-date material information for these joints can be found at https://github.com/daprice/Flexy-Joint/wiki/Materials (If you're testing any other materials, your contributions are welcome!)

Unlike Gyrobot's Hinge Mould, this is one piece to minimize cleanup after casting, and the open ends can be sealed with tape. The silicone we've tested doesn't stick too much to PLA so the finished pieces can be pushed and/or pulled out easily.


  • Update 6/24/14: Each size in the mold is labeled. You can also provide a text label for the whole mold.

Customizer warning

This currently doesn't work correctly in Makerbot Customizer for unknown reasons. Try contacting Makerbot support if you need this and can't/don't want to install OpenSCAD on your computer.


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So this allows you to print flexy-hands (various models) with no flexible filament?

Yes, but keep in mind that I have yet to find a moldable silicone/rubber (that can be cast at room temperature using a 3D printed mold) that lasts as long as printed Filaflex does.

Yep, definitely should have thought of this!! Thank you, so simple.