I have suffered several blockages over the past few weeks. Generally the filament stops being extruded for whatever reason and ends up blocking the nozzle. This is not an issue, I have invested in a huge box of acupuncture needles and so can clear that without issue. The problem is that when the blockage occurs the filament above the nozzle (a few mm above at least) splays out and then can not be removed without taking the hot end apart as it will not come out the top of the heat sink! All I can think is that the filament is getting too soft too high up? Edit: Maybe it is a speed problem on the first layer? I have it at 40%, perhaps that is too slow as I have noticed the material (both Edge and PLA) have concertinaed at times. Am I correct in my assumption? Is there a solution? Is there another reason. Here is the set up: BIGBOX DUAL (Dual Titan @Chase.Wichert design.) 0.40mm Nozzle 40mm/s Print Speed (40% first layer) Edge (Black) Bed: 100°C (First layer) dropping to 90° Head: 240° Fan on 50% after first layer.