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One red belt of stone should be enough to supply 48 Steel furnaces.
I had a shortage of stone bricks, made sure there was enough stone coming in, made sure all belts are red, even remade the furnace stack elsewhere, but it did the same thing - at all time there are no more than 24 furnaces working, supplied by a red belt of stone.

Copper and iron plates are working fine, but as you can see stone bricks are not. I attached the save file.

The recipe for stone brick takes 2 stone as input, unlike the copper and iron recipes. Therefore, a red belt of stone can only supply 24 steel furnaces, not 48.

(30 stone per second) / (2 stone per brick) * (3.2 crafting seconds per brick) / (2 crafting seconds per steel furnace per second) = 24 steel furnaces

kpreid wrote: Thu May 29, 2025 5:01 pm The recipe for stone brick takes 2 stone as input, unlike the copper and iron recipes. Therefore, a red belt of stone can only supply 24 steel furnaces, not 48.

Ok