Ever since I have had my Prusa i3v 10" I have had alot of issues with the Filament slipping, and I am recently thinking that its due to the filament jamming in the extruder.
Since abbout 60% of the time, when I pull out the filament, it will have a bend/kink in it.

What tips do you guys have for preventing this?

and

What is a good replacement / upgrade extruder setup?
The more open direct drive setups look like they would be easy to keep an eye on, and less to go wrong.