Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
This setup produces a perfectly compressed blue belt of green circuits using 6 assemblers in 25x10 tiles footprint (stacks vertically reusing beacon rows, as usual). If it's necessary to have inputs and output on the same side, just reverse input underground belts and rotate the setup if needed.
