I have one, and it is ???REALLY loud… how do I fix it? I think most people have this problem as well. 
My DM is not loud at all…
I suggest you put a single drop of thin lube in the bearing - see if that helps.
That would help and also how long have you had it? Mine was very quite the first 2 to 3 days and then it got really loud for about 3 days. When I asked people told me this was fine its just the bearing breaking in. The thin lube would help but I havnt lubed mine at all in the three weeks I have had it and it is very quite now. Hope that helps. ;D
If you don’t like the noise then lube it.
Dont have lube, getting some today… had it for about 2 years, found it in my old desk…