Hello, Last week I built my second 3D printer which has two E3D V6 0.4mm hotends. I'm having a problem with the hotend, only proved with ABS. The filament is getting stuck on the nozzle continuously. I disassembled the hotend and found that the internal bevels between the nozzle and the heat break makes a small flange on the filament, I think this is causing the filament to stop the extrusion. I'll try to illustrate this on the following pictures: If the filament becomes cooler in this joint, and this is the main purpose of the heat break, the filament gets stuck in both directions. I wonder if a flat end on this design of hotend could improve the performance avoiding this issue. Any comments? Regards, Joaquín.