I have now used two reels of CF20 with reasonable results at the specified temperatures (250C/70C) and hardened standard 0.4mm nozzle and 0.2mm or 0.25mm layers. My biggest issue has been with collecting filament on the nozzle such that blobs tended to drop off and, in one case, caused a total print failure. First layer results have always been very good and adhesion no problem on PVA juice prepared glass or on the PEI coated aluminium plate discussed elsewhere. What I did notice was that I could reduce the pick up by reducing the flow rate and finally arrived at 86% as a sensible figure but still getting pick up. What is strange is that the last jobs done pick up occurred but did not drop but stayed as an ever-growing blob, like a mushroom, on the nozzle. I can't explain why such a large reduction in flow rate does not show in the filled layers, perimeter overlap and inter-layer adhesion but it did show up in the reduced weight of the parts. To achieve the results I have I left the extrusion width on Auto, extrusion multiplier at 85% and used the Tune menu to finely adjust the flow rate; I used 1.5mm retraction with 0.25mm Z-lift with infill at varying percentages, depending on job, and always with full honeycomb and definitely not triangular as this dramatically increased pick up due to crossing the same tracks twice on the same layer; infill to outline overlap was at 30% as I needed to be sure that the strength of the part was maintained. 6-7-16 (7-6-16 US) The next job did not fare as well; this time the blob grew quickly and deposited itself right in the middle of an enclosed slot, making the part unusable. I am going to try reducing the extrusion multiplier by another 10%. Any thoughts are welcome. 7-7-16 I'll update this later.