I want to create an "isolated" smart, short and temporarily Biofuel Cycle whenever I am in need. Container is connected to Constructor which is connected to said Container.
If I put Biomass into the Container, the Belts are delivering it for the Constructor which creates Biofuel. That Biofuel should return back to the Container. Nice idea, huh?!
Well, whenever all Biomass has been depleted/constructed into Biofuel, the Container is so filled with Biofuel only. The Belts are still delivering though... but the wrong item now. It pushes those just created Biofuel, continues its work.
By a Filtering System/Feature, I could set an outgoing item such as Biomass only. So this cycle won't become stucked/stopped/interrupted by false stuff.
Whenever I am in a need of Biomass & Biofuel, I could so put Biomass into the Container, the Container would only allow to push Biomass for the Constructor, the Constructor creates Biofuel, which delivers it back into the said Container, enabling my Emergency Power for quite a time, and viola.