This mod allows you to add Gregtech Community Edition Multiblocks via CraftTweaker. See the GitHub repository for more details.
Also works client-side only, showing multiblock previews for any GT multiblock controllers you shift-right click on.
Note: for GTCEu, make sure to download the stable-gtceu
version, marked as beta so it shows on the front page.
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I work on this in my free time, please consider donating!