prusa mk3s: abnormal clogging issue

[thatgerhard]

Hi, I have an issue where I start printing and then the filament "dries up" after a few minutes (picture one) and then when I remove the filament (with some effort) it is thick in the front (picture 2) which I'm assuming is causing it to not go into the nozzle anymore. I have replaced the nozzle twice, I also checked the gears on the extruder and they seem fine. The extruder motor also turns so as far as I can tell it's fine. Any help would be appreciated, I've taken the top part aparts a few times now trying to fix this.

[Roberts_Clif]

I had this happen now a again normally if if I raise the nozzle a little the nozzle will print over this bump. What i see is high spot on the bed and raising the nozzle height the nozzle will print over it. or You could print the first layer thicker then drop the layer height to what is needed for more detailed model using one of these examples. Example1 layer height wanted is 0.14mm print the first layer at 0.28mm the model will get thinner over the high spot. Example2 print your model on a raft with 0.28 mm an print the model on raft with layer of 0.1mm.