Hopper Loop
Items endlessly cycle through a hopper arrangement that loops back on itself, wasting ticks and sometimes confusing sorting systems. A design flaw lets items circulate without ever settling.
What does this error mean?
Hoppers push items in the direction they face. An 'infinite item loop' means a circular hopper layout keeps moving the same items around, which both wastes processing and breaks the intended flow of a storage system.
Infinite item loop
Most Common Causes
- Hoppers arranged in a closed circular path.
- A sorting system with no terminal destination.
- Misaligned hopper directions.
- Overflow loops that feed back into the input.
- Mod/plugin item-pipes forming a cycle.
How To Diagnose
- Trace the hopper directions to find the loop.
- Identify where items should terminate but do not.
- Watch items circulating to spot the cycle.
- Check any item-transport mod routing.
Recommended Fixes
- Break the loop
Reorient or remove a hopper so items reach a final container instead of circling. - Add a terminal output
Give the system a definite destination/overflow that does not feed back. - Redesign the sorter
Rebuild the layout so flow is one-directional into storage. - Fix mod pipes
Correct any modded item routing that forms a cycle.
Frequently Asked Questions
It wastes hopper ticks and can jam sorting, fix the routing so items settle.
Follow each hopper's facing direction, you will find it eventually points back to the start.
No, overflow should go to a dedicated container, never back into the input.