Hopper

Hopper

Type	Mechanical power
Stackable	Yes (64)
Damage	{{{damage}}}
Protection	{{{protection}}} x
Durability	{{{durability}}}
First Appearance	2.10
Filtering	{{{filters}}}
Buoyancy	{{{buoy}}}
Gravity	{{{gravity}}}
Flammable	{{{flammable}}}
Data Value	{{{data}}}

While it appears deceptively simple (it's basically a box with a hole in it), the Hopper allows the construction of many advanced mechanisms. Any items that fall into the top of the Hopper are added to its inventory. If the Hopper receives Mechanical Power through axles mounted to its sides, it will begin to eject items from its inventory (and stop when the power is cut) out the spout below. Items may be ejected into the air, or directly into any other Block that has an inventory (chest, dispenser, Cauldron, etc.), and it is also capable of ejecting its contents into a storage minecart parked beneath it. Also, if all the slots in its inventory contain items, it will send out a redstone signal warning that it is getting full (the signal will stop when there is an empty slot in the inventory).

Crafting

Name	Ingredients	Input » Output
Hopper	Wooden Sidings, Gears, Wooden Pressure Plate, Wooden Corner

Filtering

The Hopper also contains an extra inventory slot in which you may place various items that act as a "filter" on which items it will swallow. Filtering hoppers can be placed in a trench so water will wash Items/Drops over every hopper. The water must decend one block after each hopper to avoid jamming.(Changed in 2.61 the trench can be on one level now)

Filter	Stops	Passes	Passing Examples	Misc. Effect
Ladder	Blocks	Items
Iron Bars	Unstackable items	Stackable items
Trapdoor	Max. Stack<64	Max. Stack=64	Coal, Torch, Redstone
Grate	Large Items	Small Items	Feathers
Wicker	Not powdery	Powdery	Gunpowder, Flour	Will turn gravel into flint and sand
Slats	Thick	Thin	String, Paper
Soul Sand	Everything			Will turn Ground Netherrack into Hellfire Dust, Soul Dust into Saw Dust and Dragon Orb into XP

Applications

• Collecting items
• Automated chest loading
• Automated drop sorting
• Automated refilling of any block that has an inventory
• Automated storage-mine cart loading
• Filtering Ground Netherrack into Hellfire Dust

Keep in Mind

• The Redstone signal the hopper emits if no empty slot is available will reach the block beneath it. So a booster rail will be powered if the hopper is becoming full. To stop the minecart from escaping and causing the hopper to spill its content into the air place a block dispenser so it can place a solid block next to the booster rail. With this design you can trigger the minecart when the hopper has been cut from mechanical power.
• You may place multiple hoppers into one trench without incline. But to keep the Items/Blocks separated put another block between each hopper.
• Hoppers can catch fire and thus be destroyed.
• Beware when filtering Ground Netherrack! Dropping more than 7 Ground Netherrack into the top of an unpowered Hopper without replacing the Soul Sand will cause the Hopper to break, losing half of the materials, the corner piece, and the pressure plate. It will also spawn you a cuddly new friend if on any difficulty other than peaceful. This has been changed as of 2.96 of Better Than Wolves.

Demonstration Video

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Auto Storage

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Full filtering list (will pass)

Item	Ladder	Iron Bars	Trapdoor	Grate	Slats	Wicker
Block*
Flowers	X	X	X	X
Mushrooms	X	X	X	X
Natural Saplings	X	X
Torch	X	X
Redstone Torch	X	X
Tools	X
Apples	X	X	X	X
Arrows	X	X	X
Coal	X	X	X	X
Diamond	X	X	X	X
Ingots	X	X
Stick	X	X	X
Bowl	X	X
Mushroom Stew	X
String	X	X	X	X	X
Feather	X	X	X	X
Gunpowder	X	X	X	X	X	X
Seeds	X	X	X	X	X	X
Wheat	X	X	X
Item	Ladder	Iron Bars	Trapdoor	Grate	Slats	Wicker
Bread	X	X
Armor	X
Flint	X	X	X	X
Meat & Fish	X	X
Painting	X	X
Buckets	X
Doors	X
Sign	X
Minecart	X
Saddle	X
Snowball	X	X	X	X
Boat	X
Leathers	X	X	X		X
Bricks	X	X
Clay Ball	X	X	X	X
Sugarcane	X	X	X
Paper	X	X	X	X	X
Book	X	X
Slimeball	X	X	X	X
Eggs	X	X	X	X
Item	Ladder	Iron Bars	Trapdoor	Grate	Slats	Wicker
Compass	X	X
Clock	X	X
Glowstone Dust	X	X	X	X	X	X
Ink Sac	X	X	X	X
Dyes	X	X	X	X	X	X
Sugar	X	X	X	X	X	X
Bone	X	X	X
Cake	X
Bed	X
Map	X				X
Redstone Repeater	X	X			X
Cookies	X	X	X	X
Melon	X	X
Ender Pearl	X	X	X	X
Blaze Rod	X	X	X
Ghast Tear	X	X	X	X
Gold Nugget	X	X	X	X
Nether Wart	X	X	X	X	X	X
Bottles	X	X
Item	Ladder	Iron Bars	Trapdoor	Grate	Slats	Wicker
Spider Eye	X	X	X	X
Fermented Spider Eye	X	X	X	X
Blaze Powder	X	X	X	X	X	X
Magma Cream	X	X
Brewing Stand	X	X
Cauldron	X	X
Eye of Ender	X	X	X	X
Glistering Melon	X	X
Fire Charge	X	X
Hemp	X	X			X
Gear	X	X
Flour	X	X	X	X	X	X
Hemp Fiber	X	X	X	X	X
Donut	X	X	X	X
Rope	X	X	X
Slats	X	X
Water Wheel	X
Sail	X
Wind Mill	X
Fabric	X	X			X
Grate	X	X
Item	Ladder	Iron Bars	Trapdoor	Grate	Slats	Wicker
Wicker	X	X
Strap	X	X	X		X
Belt	X	X	X
Foul Food	X	X
Wood Blade	X	X
Glue	X	X
Tallow	X	X
Haft	X	X	X
Ground Netherrack	X	X	X	X	X	X
Hellfire Dust	X	X	X	X	X	X
Armor Plate	X	X
Coal Dust	X	X	X	X	X	X
Padding	X	X
Filament	X	X	X	X
Redstone Eye	X	X	X	X
Urns	X	X
Potash	X	X	X	X	X	X
Soap	X	X	X	X
Saw Dust	X	X	X	X	X	X
Dynamite	X	X
Breeding Harness	X	X
Soul Dust	X	X	X	X	X	X
Nether Sludge	X	X
Music Discs	X
Tuning Fork	X	X
Arcane Scroll	X	X	X	X	X
Candle	X	X

Notes

• Gravel through the Wicker will separate into Sand and Flint, with flint not passing through the hopper and being left on top.