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A Generator is a contraption with the specific function to provide the player with an endless supply of certain resources. As for 1.1, only liquids and few items can be produced by them.

Liquid Generator

Generator
As it can be seen, using a 1-second timer can produce a large quantity of liquid in a minute

Materials needed:

The Liquid Generator exploits a minor glitch that causes the outlet Pumps to create more liquid than the matching inlet Pump removes, therefore increasing the amount of liquid.

Create a container, place the Inlet pump in it and fill it up with the desired liquid until the pump is fully submerged. Then, set up an Outlet pump so that the outgoing liquid falls into the container. Link the pumps to a timer and activate it, and the liquid will eventually fill it up. Take care not to leave it on too much, or you'll risk spilling liquids (especially lava); you can box the generator in to avoid such an occurrence.

The type of timer used determines the speed at which the liquid will be produced.

Bucket Duplicating

First Method

The most foolproof way to duplicate liquids is to:

  1. Make (or dig) a shallow hole 3
    Obsidian Generator Upper Part
    Watch the video above to see how the Liquid Duping is working in this model.
    blocks wide and 1 block deep, then put a block in the middle to make a W shape.
  2. Empty your Bucket on top of the middle block.
  3. Take half a Bucket of liquid from the right hole, which still fills your bucket completely.

Repeat as needed, of course this does not have to be a small W shape, there just needs to be one block separating the contents of your Bucket so that there is exactly half a bucket on the right side. This method works flawlessly for both Lava and Water. You could also try with Honey.

Second Method

Terraria Water Dupe
Two ways to make shallow holes in the ground. Wood used for illustration. Left: Result of step 2. Right: Where you should aim your bucket on either side.

A different (and perhaps simpler when mastered) method to duplicate liquids is to:

  1. Make (or dig) a shallow hole 3 blocks wide and 1 block deep.
  2. Aim your full Bucket at either the left or right side of inside the hole and click a total of 4 times to pour twice and withdraw twice. You should have a full bucket as well as some liquid covering 2 blocks of the hole, enough for another bucket of liquid.
  3. At this point you can either empty the full Bucket elsewhere and collect the duplicated liquid in the shallow hole, or use another empty bucket to pick up the duplicated liquid.
  4. You can duplicate more liquids by repeating step 2.

Mass Liquid Duplication

Large scale duplicator

A more convenient way of duplicating large scale of liquid is to utilize a glitch in the game.

  1. Build a large container to hold liquid (minimal size for this to work is 49 blocks wide and 25 blocks high)
  2. Fill up the container using above methods
  3. Break a piece of the container to allow Lava/Water to fall down (Sand block in the picture).

If you did this correctly the lava should endlessly fall without the container actually losing any liquid. With a container the size of the one in the picture, it is needed to minimize the amount coming out at the same time to prevent this method from failing. To do this, create a tiny hole that the lava has to travel through horizontally, in this case the space to the right of the sand block. When using a larger container the holes may be bigger (the extension that is needed may be removed and eventually a larger gap may be created) and a larger amount of liquids may be duplicated per time.

Be careful: if too much liquid is moving at once, all the liquid will reset; It'll skip the falling process and just end up filling what it actually would. Don't worry, it takes a lot of liquid for this to happen.

The reason this glitch works is because liquid values are integers, each block has a value of 256 that specifies how much of the block is filled, so a filled block has a value of 256 and a half-full has value 128. When the lava values differ, the engine tries to distribute the values evenly over time, but it has to round off somewhere. The idea behind this is that if you let the engine distribute 255 and 256, it fills both blocks completely. This is why you need a large container: Basically, when a bit (say 8) drips out of the exit, the engine distributes this so that two blocks miss 4, after that four blocks miss 2, eight blocks miss 1, and finally 16 blocks miss half a 'value', which it then rounds to fill up those blocks completely. This way, a tiny bit can keep pouring out while the container stays full.

Endless Waterfall

This method is an easy method used to endlessly duplicate water and is rather easy to achieve. although this method may be considered the slowest way.

  1. First build a shallow hole, nine blocks long and one block deep, above whatever you want to fill with water. It is preferable to make this hole with something that can not be broken by a pickaxe.
  2. Break the middle block and replace it with a different type of block (Block A) and place another one below it (Block B). It does not necessarily have to be a different type of block but it helps to distinguish which one to break.
  3. Pour a bucket of water into the hole.
    Endless water
  4. Break "Block A" and quickly break "Block B." Your success depends on your timing.

Water should endlessly fall from the gap and fill up whatever container is at the bottom of it. Water will usually keep falling forever until liquid settles.

The picture to the right shows the process, although the first three pictures have the wrong 'shallow hole' size.

Note: In the upcoming update, infinite waterfalls can be created by pouring water next to a half-block (also new). When flowing over it, the Water will not drain from the source. It will flow over ground like normal water; However, if it hits water it will not rise its level.

Pumps

Liquids may also be duplicated using pumps. This is the lazy man method to duplicating lava as it only need the setup and a little starting liquid.
Pump Duplicating
Duplicating liquids using a pump
Terraria How-To 1 Liquid Duplicator First How-(10:09)
  1. Place an inlet pump at the bottom of your container.
  2. Place a Timer next to it, preferably a 1 Second Timer.
  3. Place an Outlet Pump at the top.
  4. Connect the three components together with Wire.
  5. Right click the timer.
  6. Pour a bucket of liquid and let the pump do its job.

Note: This method may be rather slow at first, and may need more starting fluid than just one bucket. Having multiple pumps will increase the duplication rate but you will need a lot more starting liquid for it to work. Some experiments have been done using a multiple pump circuit, not connected to each other, and it appears as though it may be quicker to use multiple pumps, rather than just having one.

Obsidian Generator

The Obsidian Generator is meant to produce large quantities of Obsidian for building, storing, or sale (via the production of Obsidian Skulls).

Lava vat
Lava Vat
Start by constructing a Water and a Lava generator next to each other.Be sure to close them properly to avoid any accidental spilling.

Then, make a two small "pipes" that link the vats to each other, but make sure the one from the water vat is one block below the one from the lava vat: this way the water, which flows slightly faster than lava, will keep flowing into the same tile every time the block of obsidian is removed.

Vat Tunnels and Ledge
Vat Tunnels and Ledge
For an added safety measure, make sure the walls and pipes are made of Wood or Glass, which are not breakable with a pick or drill and as such can't be accidentally broken while using the generator. To farm obsidian from the generator, simply stand under the connection between pipes like the picture on the right, select a pick/drill and hold your mouse on the block:the obsidian will be dropped and placed in your inventory.
Obsidian generator1
A simple Obsidian Generator without the use of pumps.
A very effective way to make obsidian
A very effective way to make obsidian

Loot Generator

Goldfish Trap
Other monsters can be used to kill Goldfish, although this is not very profitable.

The loot generator is used to repeatedly spawn and kill monsters from Statues in order to produce various items, which can be sold or used for crafting.

Setting them up is rather simple:wire one or more statues to a timer, set up a simple trap beneath them (a thin layer of Lava to kill the monsters but leave the loot unharmed is ideal, although a volley of Dart Traps may also be used) and activate it. Monsters will spawn from the statues and die, leaving their loot.

Because Goldfish and Hooks sell for 2 SilverCoin Small each, a loot generator can make a rather
Money Gen
Very simple but efficient Money Generation. 2 Fish, 2 Skeleton, 1 Bird, several pressure plates. It all triggers and kills about as fast as possible!
large revenue, depending on the number of statues and type of timer used. A 5-second timer wired to a single Goldfish Statue, for example, can produce about 40 SilverCoin Small per minute.
Obtainable Loot
Type of statue Items
Slime Statue Gel
Piranha Statue Hooks and Robot Hat
Skeleton Statue Hooks
Jellyfish Statue Glowsticks
Bunny Statue Bunny Hood
Goldfish Statue Goldfish
Bomb Statue Bombs*
King Statue** Red Hat

* Bomb statues will drop them directly as an item. No more than 3 can be spawned at once on the screen.

** Only if the Clothier is present and can respawn; this is however inadvisable as it is slow and will kill all other male NPCs as well.

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