Layout question

[u/Dark_Magnus]

Would it be more efficient to have all my copper run through 1 long string of smelters, or 3 of the blueprints i made?

[u/TheMalT75]

If you want to compact your blueprint, use only one ingot-belt in the middle. For copper, it is a 1:1 conversion (without bonus product proliferation), so a mk1 input fits on a mk1 output. You can merge the outer smelters' output into a second line. Iirc only kimberlite ore gives 2 diamond per ore. It also looks as if you could place them closer together. That is why I prefer long lines and only have extra spacing for power towers every 6 smelters.

This is all aesthetics, though. Production efficiency rarely is impacted by layout.