When using the Auto crafter with a inactivated signal to produce iron, the signal isn't used up and can be used to duplicate 4 iron for every use inside the machine.

Should be fixed in next version

Sorry I don't get this. Can you describe better what you're doing?

Alright, if you place a inactivated division signal in a crafting bench normal it would give you some iron. If you add the recipe to the autocrafter to transfer it into iron, it will make the iron and retain the signal, allowing you to keep putting it in the crafter and duplicate iron.

sigil, he means division sigil.

^ Yeah lol sorry