This mod adds 3 tier of furnaces named "universal furnaces" you have to research to use.

The universal furnaces have inner chest and filter inserter to store unfinished recipes thanks to the superpower of artificial intelligence programmed in your electronic boards.

Now with universal furnaces, you can do mixed furnaces lines for copper, iron, steel, stone or whatever other mods add.

Mod showcase https://youtu.be/B3e5Sh1EZAo

Versions

v0.0.5
Reordered items in item menu at the end of furnaces group (eventualy)
in this order
1/ stone universal furnace,
2/ steel universal furnace,
3/ electric universal furnace

v0.0.4
Make it works for real

v0.0.3
brutal attempt to make it works with 0.17