Nozzle clogging and extruder slipping are the main factors causing extrusion problems. But what about restrictions in the PTFE tubing? Might it cause extrusion problems or, in the very least, losses in the extrusion process?  

Pulsar™ has no mixing section, but experiments have shown that there's a good shear in the screw, mostly in the later section of the extruder. This section which is very close to the nozzle adds some mixing path and fixed separation of the melt before it exits, which greatly improves the mixing.