Haven’t seen a trader selling heavy tools in a while. I have one in my windmill which I can’t give up because my villagers will starve. I have another in my foundry. They consume iron ore and coal to make iron ingots. They make 15 ingots, and I switch the heavy tools over to my blacksmith forge, where I have tools/weapons/heavy tools ratio set to 0/0/10 because I really just need one more set of heavy tools for both buildings to be operational at the same time.
They don’t make the heavy tools (or anything), and I end up short iron ingots (down to 10 or 5). I’ve repeated this several times. I don’t have an armory, I’m not initiating any upgrades of buildings, and I’m not stocking iron at my trading post. I have no idea where the iron the foundry is making is going. What is consuming it?