Factorio Forums

What did you do?
1. This was done with a mod that gives wood a burnt result (ash).
2. I placed a burner inserter, which starts with a small amount of initial wood fuel inside of it.
3. I let the inserter move items until it ran out of fuel.

What happened?
When the initial wood fuel ran out, a burnt product - in this case ash - was produced, even though I did not put any fuel into the inserter. This can be abused to produce infinite ash by mining and replacing the inserter repeatedly. (can be done at scale using construction robots!)

What did you expect to happen instead? It might be obvious to you, but do it anyway!
The burner inserter's initial fuel should not produce a burnt result output. I expected it to only produce a burnt result when a real fuel item has been consumed.

Does it happen always, once, or sometimes?
Always.

The gif attached shows this being abused to make infinite ash. (It speeds up in the middle because I used the editor time speed-up shortcut)

Thanks for the report however I don't consider this worth adding additional complication to the burner inserter logic. If you are modding the burnt result of wood, you can also mod the initial fuel for burner inserters to some other fuel item that doesn't have a burnt result.