Where is a good place to farm metal shards?

Solution 1:

There are some tips for farming shards from here and a reddit thread

Here is one:

1. Buy the Shadow Sharpshot Bow
2. Craft Harvester Arrows
3. Return to the first hunting ground you run into (with the Watchers and Grazers).
4. Choose the trial that requires you to shoot a certain number of Blaze Canisters off the backs of Grazers.
5. Take the rope down, then stealth kill the entire herd with your spear.
6. Once they're dead, go to each body and shoot off all 4 Blaze Canisters with the Harvester Arrow.
7. Loot all bodies and pick up the canisters off the ground.
8. Speak to the Trial Giver and restart the Trial.
9. Rinse and repeat the kill/harvest cycle.