Shredder
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The shredder is a machine used to shred (or pulverize) materials. Can shred 9 items simultaneously.
It requires 2 shredder blades and power in order to operate. Consumes ~300HE per operation.
It can be assembled with the following recipe:

Usage

Put the two blades in their slots, then fill the 9 slots above with items to be turned into powder.
It will turn everything in those slots into powder at the same time, so it is possible to shred several different items at once. This is highly recommended even when shredding stacks of the same item as it uses less power, time, and blade durability.
If ore is placed inside, it will output 2 of the dust form of the item, which can be smelted into 2 ingots of the item. Though overall inferior to the centrifuge in this role, as it doesn't use blades that have to be replaced, and produces up to 3 or 2 with a secondary output, it is good for early gameplay for more efficient ore processing or processing a significant amount of 1 or more ores.
Trivia
- If a non-metal is shredded (e.g. diamond, emerald), it cannot be smelted back into normal form. Instead one should use a press, an ore acidizer or a tier 3+ anvil to do that.
- If an item is added into an empty spot in the shredder while it is still undergoing an operation, the added item will be shredded without any added power, time, or blade durability consumption.
- If an item without a powder form or otherwise designated output, it will turn into scrap. So please, use NEI to check the recipes before sticking random items inside.
- Scrap can be used as furnace fuel for 4 operations or turned into blocks (4) for 20 operations. Useful for ridding yourself of useless or dangerous items.
- If scrap is re-shredded, it will turn to dust, which can also be used as furnace fuel (2) or turned into scrap blocks (9 instead of 4). Doing this is pointless as dust is inferior to normal scrap and just wastes blade durability and power.
- Dust can also be made by shredding a powder that does not have a designated output.
- Scrap can be used as furnace fuel for 4 operations or turned into blocks (4) for 20 operations. Useful for ridding yourself of useless or dangerous items.
- There used to be a curious yet exploitable bug/error where if one shredded a Fluxed Electrum ingot from Thermal Expansion: Redstone Arsenal, it would've yielded 2 dust instead of 1. These 2 dust could've been put back into an Induction Smelter (also from TE) and made into 2 ingots, allowing for the process to be repeated.
- This has since been fixed.