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The original was posted on /r/factorio by /u/nullable_ninja on 2024-11-05 16:55:48+00:00.
There is no way to filter which items are sent down to a planet from your platform. This means that ships dedicated to a certain delivery are severely limiting.
Example:
I have ship A transporting calcite from Vulcanus to Nauvis.
I have ship B orbiting Nauvis making space science to be dropped to Nauvis.
Nauvis is set up to have requests for both calcite and space science.
Ship B needs calcite to run, so it gathers from asteroids and stockpiles it. However, because Nauvis is expecting calcite shipments, Ship B does NOT stockpile it and instead continuously drops it to Nauvis.
If there was a way to filter exports on ship B so that only space science is sent, that would be amazing!
Note: I know this particular example could be worked around (like buffering the calcite on belts), but my point remains.
EDIT:
A lot of people are focusing on my particular example and missing the point of my post. Simply put, there is no way to restrict certain items from being sent down to your planet. There will be instances you only want to send down materials A and B and hold on to C for whatever reason (maybe supplying it to a different planet, maybe using it, etc.). If the planet you are dropping off is requesting C you have no choice but to drop it. Even if the intended supplier is another ship.