Hi, i just got some paht cf from bambu and an ams ht. I did a first print and was able to load the paht cf through the regular ams no problem. After trying to start a second print, the filament keeps stopping a few centimeters from the hotend and just cant gdt to the end. I loaded petg in the ams and it worked fine. I redid it after with the paht cf and same problem. I then used the ams ht to load it and it worked. Why does it suddenly do this?