For me it worked to cut the Springs on the First Circle of the spring on the Cfs and the extruder and it worked well.
So I have been Reading a lot of comments on the grinding Filament Problem and also having the same problem. So I came to this conclusion. The spring dose not have enough force to push down on the filament. Its to soft of a compression spring. Solution, go the your local hardware store and bye a 21/64 x3-51/16 compression spring. Also bye some 4mm small OD flat washers. This spring is just a tad stronger than the one Creality uses. Measure and cut the new spring about the same length as the Creality one. Take one 4mm washer place it on the inside of the depressor switch. If its to tough to fit in you may have to trim a little bit more spring off to make it fit. The washer is there support against the bottom depressed switch so it wont crack the plastic. I have done this and had no problems so far (knok on wood. 
LOL) I hope this works for everyone.