Automatically feeds labs with the highest available quality of science packs from a chest. Empty inputs come first. Before switching quality, the inserter waits for the existing packs to run out while continuing to deliver other pack types.

To enable it, open the inserter and tick “Quality priority (prototype 0.7.0)” in the separate panel below the window, at the bottom left. The mod manages the inserter's filters automatically and restores your previous settings when disabled.

Experimental version for Factorio 2.1.23+. For now, please test only one chest → one inserter → one lab. Only ONE inserter should take items from that chest. Multiple inserters sharing a chest have not been verified. Please use a copy of your save.

Initial player testing was done with Krastorio 2.1.4 and Space Exploration 0.7.63; neither mod is required. Modded science packs are detected from the target lab's supported inputs.