ITEM SORTER
A single sorting slice that filters one item type from a hopper line. Uses a comparator to detect when the filter hopper has extra items, then unlocks the bottom hopper to send them to storage. Tileable for full sorting systems.
Materials List
Overview: what the Item Sorter is and does
A single sorting slice that filters one item type from a hopper line. Uses a comparator to detect when the filter hopper has extra items, then unlocks the bottom hopper to send them to storage. Tileable for full sorting systems.
As a storage build it moves and organises items with hoppers so incoming loot lands where it belongs without manual sorting. It sits at an intermediate level: nothing exotic, but the timing between parts has to be right for it to work smoothly.
It fits in roughly 1W x 5L x 4H per slice (tileable) and works in Minecraft 1.5+ through to the current 1.21 release.
How it works: the redstone mechanics
The trick is a filter hopper holding one of the target item plus four un-stackable items in its other slots. A comparator reading that hopper jumps in signal only when a fifth matching item arrives, and that signal unlocks the output hopper below just long enough to drop the surplus into storage — so only the wanted item is ever released.
The core parts doing the work are hopper, redstone Comparator, redstone Repeater, redstone Torch, and redstone Dust; the remaining materials are structure and wiring that hold those pieces in the right relationship.
Because it runs on hoppers, throughput is capped at 2.5 items per second per hopper, so parallel lines beat one long chain when volume is high.
How to build it
- 1Place the main hopper line (input stream) running horizontally.
- 2Below one hopper in the line, place a second hopper pointing into a chest (the output).
- 3In the filter hopper (the one in the main line above the output hopper), place 1 of the target item in the first slot, and 1 non-stackable item in each of the other 4 slots.
- 4Place a comparator reading out of the filter hopper (side output).
- 5The comparator signal goes into a block with a redstone torch on the far side.
- 6The torch output powers the bottom hopper, keeping it LOCKED (items stay in filter).
- 7When the target item fills the filter hopper past the threshold, comparator signal rises, torch turns off, bottom hopper unlocks and pulls items into the chest.
- 8Tile this design side-by-side for each item type you want to sort.
Uses & applications
- ▸As a storage build it moves and organises items with hoppers so incoming loot lands where it belongs without manual sorting.
- ▸Built from 5× hopper, 1× redstone Comparator, 1× redstone Repeater, and 1× redstone Torch and more, it slots into a survival base as a intermediate-level project.
- ▸Feed it from your farms and mob grinders so loot sorts itself the moment it arrives.
- ▸Label sections with item frames so the system stays readable as it grows.
Tips & common mistakes
- !The four filler slots must hold genuinely un-stackable items (like a saddle or a sign); any stackable filler throws off the comparator threshold and the sorter leaks.
- !Test the full cycle in a creative-mode copy first, then rebuild it in survival once you know the timing holds.
- !Remember a powered hopper is locked, not active — keep stray redstone away from the hopper lines unless you deliberately want to gate item flow.
Item Sorter FAQ
How do you build an Item Sorter in Minecraft?
Place the main hopper line (input stream) running horizontally. Below one hopper in the line, place a second hopper pointing into a chest (the output). The full build takes 7 material types and fits in about 1W x 5L x 4H per slice (tileable).
What materials does an Item Sorter need?
The main materials are 5× hopper, 1× redstone Comparator, 1× redstone Repeater, and 1× redstone Torch, plus the remaining structural and wiring blocks.
How hard is the Item Sorter to build?
It sits at an intermediate level: nothing exotic, but the timing between parts has to be right for it to work smoothly. It is compatible with Minecraft 1.5+ and later.
How does the Item Sorter actually work?
The trick is a filter hopper holding one of the target item plus four un-stackable items in its other slots. A comparator reading that hopper jumps in signal only when a fifth matching item arrives, and that signal unlocks the output hopper below just long enough to drop the surplus into storage — so only the wanted item is ever released.
How does a redstone item sorter pick out one item type?
A filter hopper is pre-loaded with the target item plus un-stackable items in its remaining slots, sitting right at the comparator's detection threshold. When a matching item flows in it tips the comparator over the edge, which unlocks the hopper below to release exactly that item into storage. Non-matching items pass on down the line.