How to keep a set amount of items in an inventory?

[Gmoff01]

I'm trying to maintain three different types of feed in an animal feeder in DW20, but if I just use an exporter eventually one type of food will replace the others. I'm pretty sure there's a way to specifically maintain one stack of an item in an inventory, but I dont remember how. Help?

Thank you!

 

[ShneekeyTheLost]

Thermal Dynamics can do it, with a Retriever of Signalum or Enderium, you can set it to keep a precise amount in inventory at all times.