Also keep in mind, the recipes for food items could use your farms for input. If you pour over the default or 'extended' recipes, there might be some wildly profitable ones, but I haven't looked. 'Free production' might be your best bet for something that is effective, but requires a lot of labor to setup and still involves the economy side of trading. At that point, you might as well just print money.but well.at least you'd still have to manage production and find buyers for your wares? The water purifier method is already basically the same thing. There is at least one mod that removes the material cost of machines. That might be improved by 'manufacturing extended' or other mods that add new manufacturing if they add a more cost effective recipe. You could probably game the manufacturing system turning less valuable junk into more valuable gear, but the rate at which you could acquire junk from junk vendors would probably make it only marginally effective (maybe mod the junk dealers for supply as well?) since the bulk supply purchases are vastly overpriced. You could use a mod to increase settlement attack rates and sell the loot from the attackers.
