Dense Smelting Block ILS (118 Negentropy Smelters, ILS)
This smelting setup attempts to minimize wasted belts and space. Also nice thing about it is that only 2 Satellite Substations used for energy distribution. This one produces Titanium, but you can switch recipe to other ores and it will still be fine. Blueprint width allows to put 2 lines of these bad boys in the sub-equatorial sector if you don't mind building on one of the tropic lines. Since each belt is used from 2 sides - maximum length is 20 smelters because 40 smelters per belt result in 120 items/s in most recipes.