A simple Gleba orbiter that can supply your factory with free iron and copper ores, calcite, sulfur, and carbon from space. Requires advanced asteroid processing to get the calcite, copper, and sulfur which is unlocked on Gleba, though you can prepare the ship well before then and change the recipes once unlocked.
All common items should work fine (though if not, there's plenty of room for more panels and accumulators). It is able to fly from your shipyard on Nauvis or Vulcanus just fine, though that single flight may take a bit. Once in orbit, it should stay there forever, dropping goodies so you don't have to make them with gross Gleba fruits.