Improve grabbing from undergrounds

[Zaspar]

07-18-2026, 18-38-25.png (140.64 KiB) Viewed 209 times

Currently, inserters are not able to take directly off an underground belt if the item is coming from another inserter. This quite a surprising behaviour to me, after many inserter improvements have been made such as burner inserters taking off faster tiers of belt. They should be buffed so they can grab from the belt in this scenario.

[eugenekay]

The (yellow) Inserter drops to the middle of the Tile/Transport Line. In the next tick the Item has advanced into the underground portion, where it is unavailable for Pickup. No amount of "buffing" by increasing the Inserter Speed will change this.

You can use an Adjustable Inserter mod to have the Item dropped into the "corner" of the Belt instead; this then gives the Fast Inserter sufficient time to grab the Item before it goes past. This is slightly more powerful than the ability to change Left/Right lane introduced in FFF-442.

07-18-2026, 14-05-33.png (84.59 KiB) Viewed 192 times

Good Luck!

[Zaspar]

The (yellow) Inserter drops to the middle of the Tile/Transport Line. In the next tick the Item has advanced into the underground portion, where it is unavailable for Pickup. No amount of "buffing" by increasing the Inserter Speed will change this.

You can use an Adjustable Inserter mod to have the Item dropped into the "corner" of the Belt instead; this then gives the Fast Inserter sufficient time to grab the Item before it goes past. This is slightly more powerful than the ability to change Left/Right lane introduced in FFF-442.
07-18-2026, 14-05-33.png

Good Luck!

Sure, then the suggestion is to change undergrounds so that this behaviour is possible to make work. Why shouldn't it work?

[Filcius]

The inserter could take from the underground part, on the tile in front of him.