Hi,I tried to print in both PLA+ABS with my flashforge creator pro but without any success.did someone experience the same issue and can help please ?I tried with simplify3d and replicatorG and got the same result. the PLA filament is blocked between the PET tube and the "MK8" extruder and I have to umount this part in order to remove the plastic.I also tried different PLA filament and also reverse PLA and ABS extruder side and always got the same issue...the first layer of PLA is ok, then when it switch from ABS to PLA again, the problem is present everytime (even on different models)thanks in advance for your help !Sebastien