Hi gr5,
Thanks for the detailed answers.
1) No successful printing so far.
2) I have a S5 stand-alone.
3) I tried your suggestion after hot and cold pulls, unfortunately no extrusion.
4) I have attached some photos as a result of the cold pull, maybe you will know more after checking this?
5) I am 100% sure I put the lever down. But I think maybe there is not enough force to push the PLA to extrusion?
6) In the first post I already tried two cores. Same problem.
Any ideas on how to proceed?