When u grind coffee a dusting of very fine coffee grounds cover the outside of the lid. After removing the lid B sure to wipe away this dusting before replacing the lid. The space between the lid and the body opening is very tight. So the dust causes the lid to stick shut.
If you are using for the Ekobrew I guess it could but I use my Hario grinder because its tricky... you can have too large a grain or the coffee is light/watery and too fine a grain and the keurig can't seem to even push water through. You need a level of control you can't get with any allpurpose grinder like this