A thermoacoustic Stirling engine with a single moving output part is now fully 3D printable, including the burner and hot end, which are designed for SLA metal printing. The project, built by the creator behind OwnEnergy.org, runs on homescale biogas and requires minimal non-printed components.
The key upgrade since the last Hackaday coverage in March 2026 is a biogas and methane burner integrated directly inside the 3D-printed hotend. That geometry, which enables efficient heat exchange, would be difficult to achieve through conventional fabrication. All plans, data, and collaboration tools, including a forum and Discord, live at OwnEnergy.org.
The original article is worth reading for the engineering detail behind the heat exchanger geometry and how the biogas plant feeds the engine as a closed loop system. This is not a toy demo. It is a documented, open-source attempt at practical home energy generation, and the design is still evolving.
[READ ORIGINAL →]