This thread's a bit old but I'm having very similar trouble, been printing for a year or so on a hytbrid delta with an E3D V6 (Bowden) and an EZStruder and recently started to print using Taulman Bridge Nylon at 250c

I can only get so far into a print before the filament stops moving, but it doesn't appear to be blocked at the nozzle. Instead it seems to be binding up somewhere higher in the E3D, if I pull it out and try to work it back in manually I can even feel where it's binding. Cutting about two feet off the filament and starting again seems to to get me started again but only for a while.

Did a couple of cold pulls and got some junk out but it hasn't solved the problem. It's almost as if the filament is getting wider but if I check it with a caliper it's still 1.75.

Any ideas?