Blind Sage

Quest Reward Items in Borderlands 2 can be farmed on PC by Read-Only farming.

How to Read-Only farm:

1. Go to the location where you hand in the quest.
2. Save the game by toggling your Badass Rank on/off.
3. Then go into the file explorer on your computer. Go to the file path:
   C:\Users\NAME\Documents\My Games\Borderlands 2\WillowGame\SaveData
4. Go to your most recent Save File (.sav) and:
   right-click → properties
5. Under General tick the Read-only box.
6. Back in-game and hand in the quest.
7. Exit to the main menu, then back into the game.
8. Now you will be able to hand in the quest again.

Tip: Store the items in Claptrap's Secret Stash.
This way you can get the quest reward items multiple times since they are saved on a different SaveFile.

In Borderlands 3 Quest Reward Items are rewarded after or during a quest. After the quest is completed there are 2 ways to farm Base Game items:

• Eridian Fabricator:
  On the Legendary firing mode, the Eridian Fabricator occasionally drops quest reward items from Base Game.
• Crazy Earl's Veteran Rewards machine in Sanctuary has one Quest Reward Item from the Base game as the Item of the day.

DLC quest items can't be farmed by these methods.

Quest Items are items that are only used during a quest. They adapt to the player level.
After the quest is completed the item is removed from your inventory.
Base Game items can be farmed in 2 ways even after the quest is finished:

• Eridian Fabricator:
  On the Legendary firing mode, the Eridian Fabricator occasionally drops quest reward items.
• Crazy Earl's Veteran Rewards machine in Sanctuary has one Quest Rewards as the Item of the day.