Grinder

For the grinder in Borderlands 2, see The Overlooked: Shields Up.

The Grinder is a device located in Janey Springs's workshop in Concordia, and is usable after completing the mission Grinders for Springs. The Grinder consumes three weapons or items fed to it and produces a new random weapon as a result.

The items fed to the grinder must conform to a recipe which determines the type and quality of the output. A recipe defines a combination of item types and rarities taken as input and what rarity and type the resulting output may be.

The level requirement of the produced item is the average of the level requirements of the input items, rounded down.

Moonstone-assisted grinds significantly increase the chances of an optimal result, and may also result in Luneshine bonuses.

Recipes

The following list may be incomplete.

Weapons
Output	Input	Notes
Legendary weapon of desired type	1 purple weapon of desired type + 2 legendary weapons	Without moonstone, there is a chance of getting purple. With moonstone, there is a chance of getting a Luneshine weapon.
Legendary weapon of random type	3 legendary weapons of any type (same type gives random legendary)	Without moonstone, there is a chance of getting purple. With moonstone, there is a chance of getting a Luneshine weapon.
Purple weapon of desired type	2 purple weaponss of the desired type + 1 additional blue weapon	Cannot do a moonstone grind with this.
Purple weapon of desired type	2 blue weapons of desired type + 1 Additional blue weapon	Without moonstone, there is a chance of getting a blue. With moonstone, there is a chance of getting a Luneshine weapon.
Purple weapon of random type	3 blue weapons of different types	Without moonstone, there is a chance of getting a blue.
Blue weapon of desired type	2 green weapons of desired type + 1 additional green weapon	Without moonstone, there is a chance of getting a green.
Blue weapon of random type	3 green weapons of different types	Without moonstone, there is a chance of getting a green.
Green weapon of desired type	2 white weapons of desired type + 1 additional white weapon	Without moonstone, there is a chance of getting a white.
Green weapon of random type	3 white weapons of different types	Without moonstone, there is a chance of getting a white.
Assault Rifle	1 SMG + 1 Sniper Rifle + 1 Shield, all of the same rarity	Input must be blue or below. Output rarity will be the same or one higher.
Rocket Launcher	2 weapons + 1 Grenade Mod, all of the same rarity	Input must be blue or below. Output rarity will be the same or one higher.
Shotgun	1 Pistol + 1 SMG + 1 Shield, all of the same rarity	Input must be blue or below. Output rarity will be the same or one higher.
SMG	1 Assault Rifle + 1 Pistol+ 1 Shield, all of the same rarity	Input must be blue or below. Output rarity will be the same or one higher.
Sniper Rifle	1 Assault Rifle + 1 Shotgun + 1 Shield, all of the same rarity	Input must be blue or below. Output rarity will be the same or one higher.
Shields, Oz Kits, Class Mods, Grenade Mods
Output	Input	Notes
Orange item of type	3 purple items of the same type	Without moonstone, there is a chance of getting a purple. Does not work with Class Mods.
Purple item of type	3 blue items of the same type	Without moonstone, there is a chance of getting a blue.
Blue item of type	3 green items of the same type	Without moonstone, there is a chance of getting a green.
Green item of type	3 white items of the same type	Without moonstone, there is a chance of getting a white.

Notes

• Input class mods may be for any class, including different classes. The only requirement is that they have the same rarity.
• Any class mod produced will always be of the type usable by the current character.
• It is not possible to obtain the Excalibastard from a Grinder recipe.
• A hotflix on November 11th, 2014 added the ability to grind three purple items together, and added recipes for legendary grenade mods, shields, and Oz kits, as well as an extra legendary weapon recipe.
• Combining three random purple weapons have a chance to produce a random legendary weapon.
• The level of the gear produced by the Grinder corresponds with the lowest level item put into the Grinder.