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I recently installed this mod for myself, removing the good but cumbersome KSP Interstellar Extended mod, and installing this one because of Epstein's drive. In fact, the engine itself has not yet been tested under constant load, but as I understand it, based on the KSPIE mod, this engine, or rather its engineering, needs very powerful cooling. Only this applies exclusively to the KSPIE mode, in the MEV mode I did not see a strict list of additional equipment for the normal functioning of the engine. Try experimenting with heatsinks. Can overheating be removed? I can also see the possibility of showing mods on the engraver, some kind of collection in config files. But that's just my guess.