I have read everything I can find on using XT-CF20 on this forum and I'm still not getting good results. I've been printing with carbon filled PLA (inexpensive SUNLU brand) up to now and getting good results - i thought I'd upgrade and try using the XT-CF20 since it seems to be well regarded and should be stronger, but so far it is unusable. I'm using a titan aero, a 0.4mm plated copper nozzle and slicing with S3D The main problem I'm having is sag - bridging sags and even fairly modest less than 45 deg overhangs sag. When I speed up my bridging there seems to be no happy medium between breaking the filament and having it sag. even worse sometimes the bridging performance is wildly inconsistent on the same print with the same settings! Then the well documented problem of ooze material building up on the nozzle. I've improved this by reducing extrusion multiplier and some other things but nothing really solves it. I've also been getting softer corners than with PLA CF. the setting ranges I've been playing with are: retraction 0.8-1.2mm retraction speed 30-40mm/s print speed 40-45mm/s with slight reductions for perimeters. extrusion multiplier 85-100% bridging speed 130-140% bridging extrusion 90-130% linear advance K40 acceleration 500 X and Y jerk 8-12 cooling fan 0-60% with 100% on bridges nozzle temp 230-245 (230 works best so far) bed temp 60 S3D profile is attached to this post nothing I've tried so far really has much clear effect. The test prints are all slightly different but not in a way that sensibly correlates with the changes I've made... it just seems like this stuff is uncontrollable. strangely I've not been getting any stringing, which I would expect to given that all the other problems indicate an oozing and overly liquid filament. any suggestions?