- Compression Spings x1
- High Pressure Hull x1
- Crown Gear x1
- Pressurized Vessel x1
To unlock External Combustion Engine you need x1 each of previous mentioned items plus Artifact of Springs x1 and Artifact of Gears x1
(From the Research Nexus, click on the Advanced Recipes button underneath the ingredient list. Select the artifacts and ingredients, and click Research.)
Crafting Material ImageEdit
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