Crafter Auto-Crafting Basics: Your First Automatic Workshop

What you will get

Before the crafter, automatic crafting needed complicated tricks. Since version 1.21 the crafter does it directly: it holds a 3×3 grid, accepts items from hoppers and crafts once per redstone pulse. This guide builds a small automatic iron block maker and explains how to adapt it to other recipes.

Materials

Crafter (5 iron ingots, 2 redstone dust, 1 crafting table, 1 dropper), 2 hoppers, 2 chests, 1 comparator, 1 repeater, redstone dust, a few building blocks, 1 button for testing.

Step-by-step

Step 1: Craft the crafter. Place 5 iron ingots around the top and sides, the crafting table in the middle, redstone on both sides of the bottom and the dropper at the bottom centre.

Step 2: Place it facing the output. The front side (with the opening) is where finished items come out. Put a hopper and chest in front of it, or let items drop on the ground while testing.

Step 3: Set the recipe. Open the crafter and click empty slots to disable them. For iron blocks leave all 9 slots enabled; for a chest disable only the middle slot.

Step 4: Add the input. Put a chest with ingredients on top of a hopper that points into the crafter. Hoppers fill enabled slots evenly, one item per slot.

Step 5: Test with a button. Place a button on the crafter and press it. If the grid holds a valid recipe, one item comes out of the front.

Step 6: Automate with a comparator. A comparator reading the crafter outputs a signal equal to the number of filled or disabled slots. When it reaches 9 all slots are ready – use this signal (through a repeater) to power the crafter.

Step 7: Collect the output. Point a hopper away from the crafter's front into a chest so crafted items are stored automatically.

Step 8: Expand. Chain several crafters in a row, each fed by its own hopper, to build larger workshops for blocks, rails or redstone parts.

How to check it works

Put 18 iron ingots into the input chest. After a moment you should find 2 iron blocks in the output chest and no ingots left in the crafter.

Common mistakes

Placing the crafter the wrong way round – items come out of the front only.
Forgetting to disable unused slots – hoppers then fill every slot and the recipe breaks.
Using a constant signal – the crafter only crafts on a new pulse, not while powered.
Feeding mixed items with one hopper for complex recipes – use one crafter per recipe.

Variations

Combine the crafter with a farm output, for example turning wheat into hay bales or kelp into dried kelp blocks, to save chest space. A clock circuit works too, but the comparator method avoids wasted pulses.

Tip: Disabled slots never get filled by hoppers, so the recipe pattern always stays correct.

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