You want Assemblers and Furnaces that upgrade with more Items produced and smelted?
This is the mod for you.
Assembler 1 -> 25 Levels, upgrades to Assembler 2 after 25 Levels
Assembler 2 -> 50 Levels, upgrades to Assembler 3 after 50 Levels
Assembler 3 -> 100 Levels
Stone Furnace -> 25 Levels, upgrades to Steel Furnace after 25 Levels
Steel Furnace -> 100 Levels
Produced items get stored in memory when deconstructing factories and furnaces and are reapplied on building, so you do not lose those precious levels on refactoring your factory.
All aspects of the mod are configurable via mod settnings. Dont like leveled up assemblers using more power? Disable it! Dont like the progression curve? Change it!
Please report any bugs and suggestions here: https://github.com/renoth/factorio-factory-levels