Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
Cargo ship for the internal Planets. This uses circuts and a route such that you can just create one for each route you have between two planets. Add requests for the items you need and it will do the rest. Delete any planets that are not relevant for your route.
