Steel Fiber: Drop sources, locations, and probabilities

Tips

There are many ways to get Steel Fiber in Warframe, but my recommendation for optimal efficiency would be to try one of these missions (in this order):

• Earth/Everest : It's a Excavation mission (level 1-6). The item is dropped on rotation B (7.69%).
• Venus/V Prime : It's a Survival mission (level 3-8). The item is dropped on rotation B (7.69%).
• Venus/Kiliken : It's a Excavation mission (level 3-8). The item is dropped on rotation B (7.69%).
• Mercury/Apollodorus : It's a Survival mission (level 6-11). The item is dropped on rotation B (7.69%).
• Earth/Tikal : It's a Excavation mission (level 6-16). The item is dropped on rotation B (7.69%).

These recommendations are based on the usual missions lengths, and the probability of getting the resource dropped.

Missions with a Chance to Get Steel Fiber as a Reward

Warframe Rotations Explained

• Survival: One reward every 5 minutes, following this pattern: AABC.
  Rotation A at 5 and 10 minutes, B at 15 minutes, C at 20 minutes, etc. Then it starts all over again (25min is rotation A).
• Excavation: One reward after each excavator successfully completed, following this pattern: AABC.
  Rotation A for the first two excavators, rotation B for the third and rotation C after four.
  Then it restarts from the beginning (5th excavator is rotation A).

Mobs Dropping Steel Fiber

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