I've had my E3D v. 5 for a month or so but have not been able to get it to reliably print either ABS or PLA. ABS does seem a little more printable but it is certainly not consistent - I have managed to get some small pieces printed in ABS. Usually, the print will go well for several minutes (but sometimes up to an hour) before the jam occurs. I am using good material that prints fine from both a J-head and a Hexagon hotend. I am using a MakerFarm Prusa i3 with a Greg's Wade's direct extruder, 3mm filament, 0.4mm nozzle. I have used both KISSlicer and Slic3r. The fan is on 100% of the time (wired directly to the power supply) and is lined up with the bottom cooling fin. The bottom fin does not feel much, if any, above room temperature. Things I have tried: 1. PLA printing temps from 185 to 235. ABS printing temps from 230-250. 2. Different PLA and ABS from another reputable supplier. 2. Canola oil 3. Cleaning the hotend out with a pipe cleaner and solvent. Also, there do not seem to be any significant rings from machining in the barrel. 4. Replaced the brass nozzle. 5. Retract lengths from 0 to 2 with retract speeds from 5 to 30 mm/s. 6. Print speeds from 30mm/s to 100mm/s. As time has gone on, things seem to be getting worse. I took everything apart and cleaned it all just a couple of days ago and still nothing has improved. Any suggestions?