socalledunitedstates:

Helioforge: DIY Self-Replicating Solar Forge

The Helioforge project is an open source effort to create accessible designs for self-replicating solar kilns and hydrogen crackers that utilize readily available resources. Our goal is to produce a entire catalog of open source devices and designs for DIY self-replicable solar forges that utilize common materials. If we succeed in our mission, it will be possible to manufacture any number of products at home using ubiquitous materials like sand, sun and water, and/or recycled polymers.

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This website hasn’t been updated in quite some time, but the designs are open-source and ready to be picked up and developed further