For engineers, buy last expansions cheap materials and turn them into this expansion recipes

You can buy severite ore, turn them into bolts. Then use those bolts to “pilfer through parts”. You get “Pile of Rusted Scrap”, then you “Scour Trough Scrap” get invention from it. Then you “Disassemble invention”. From there you get 3-7 “Hastily Scrawled Notes”. Turn 15 of those into “Comprehensibly Organized Idea”.

That is such a easy shortcut unlocking new recipes.

Serevite ore is not cheap anymore. It’s expensive thanks to Engineering.