So I was doing the fighter's guild quest "Will of the Council" and at some point I failed at something and had to abandon the quest and re-take it. This is when I realized this would be a good exploit in farming crafting materials.
-Firstly this quest sends you through a portal to a blacksmithing area where Merric builds you a weapon of your choice.
-This item is (with your choice) either a longsword, bow, staff or a greatsword. It's quality will be blue and will be a level 40 item.
-Choose your weapon
-Wait for merric to craft it
-Pick it up
-Abandon the quest
-Repeat the process
-Profit!
Not quite sure if I explained good enough, if you have any questions feel free to ask.
The process doesn't seem very efficient but hey it's an exploit!
edit: just realized when you abandon, the item disappears so all you have to do is when you pick the item up, teleport to town and deconstruct the item there, and then abandon the quest.