This happens to my 1.1 plus EVERY time with ANY PLA filament including stock.
For some reason there is bad heat creep on the 1.1's extruder pipe, i have to disassemble every time, remove the hot end from the heat sink assembly and use a large paperclip heated red hot, plung it into the stuck filament, let it cool for a second or two and pull it out with pliers(i do this with the extruder still hot from an unload filament cycle)
XYZ Support has been less then helpful, telling me to clean the gears, re-calibrate, etc. nothing useful.
I will have to look into the fan move mod to see if that works. As of right now I can only print very small PLA objects.
I also have a 2.0A and it prints PLA without issue, it appears to have a similar extruder setup so I am not sure why it works and the 1.1 doesnt.
G