Quote Originally Posted by Sebastian Finke View Post
Perhaps on a more basic level: have you checked to see if anything is possibly preventing your spool from rotating freely? There might be just enough friction to prevent the extruder from pulling the filament.
I had this exact same problem. The print would stop at the same spot every time. Spent hours troubleshooting. Turned out, the spool was getting stuck on the stock spool holder. I designed a smaller one and have never had that issue again.