Factorio Forums

As shown in the picture, a biochamber using common nutrients as fuel will trash the common nutrients to use higher quality nutrients as fuel, which sucks.

Post the save and steps that show the issue and add the version of the game to the title please, see 3638.

If you don’t want this behavior you can set a filter on the fuel slot to restrict what goes into it.

Rseding91 wrote: Mon Jul 07, 2025 2:28 am If you don’t want this behavior you can set a filter on the fuel slot to restrict what goes into it.

I could actually kiss you rn.

Rseding91 wrote: Mon Jul 07, 2025 2:28 am If you don’t want this behavior you can set a filter on the fuel slot to restrict what goes into it.

Still, biochamber should not reject valid fuel because better fuel becomes briefly available? It should use up entire fuel and then seek for new fuel once it's empty.

The biochamber will never *move* fuel from the fuel slot into the trash slot. What likely happened is: the biochamber ran out of fuel and both the fuel inserter and quality fuel inserter grabbed items at the same time - with the quality one inserting first, and the non-quality one seeing "it's full, but is a spoilable item - so put it into the trash slot".

I see. All good then.