Connect a splitter to each transport belt and drop the output stone into the lava with bulk inserters.
Сan be extended up to 10 times (maybe need to upgrade stone output line at maximum 10 tile size).
by Unknown Author · updated 11/4/2024 · 7

Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
Connect a splitter to each transport belt and drop the output stone into the lava with bulk inserters.
Сan be extended up to 10 times (maybe need to upgrade stone output line at maximum 10 tile size).