Hi all, I'm really hoping someone can help, because I'm super frustrated and quickly getting the impression that Chinese clones are pretty much the way to go from now on. I've finished calibrating and for the most part I'm pretty happy with the quality. It's quiet and when it's printing well it produces some of the best layers I've seen. Using eSun PETG on a Hypercube Evolution at 245°C nozzle temp and 85°C bed temp (straight glass, no glue). Retraction is at 1.5mm if I recall correctly and movement is quite conservative - 53mm/sec printing, 160mm/sec travel, outline 50% underspeed, retraction 60mm/sec, and retraction vertical lift a mere 0.3mm. 0.2mm layer height and slicing using Simplify3D. Printing from a Duet WiFi. Problem being that I can't print with it for more than half an hour without somewhat of a jam happening. It's not a 'hard' jam either - it sometimes clears up. I've attached a pic of the Polymaker PolyPearl Tower Torture Test that I've been trying to get a successful print on. It's quite small at only 99mm high and features a lot of challenging geometry. The lowest arrow on this shows the first few layers it happened on. Hard to see but there's two layers which had issues, but there were three or four layers between them which printed fine. The small inner struts in the pic show this too (it didn't just affect the one closest to the arrow - almost all artifacts on that layer were affected. Second arrow from the bottom shows a completely failed layer. This one failed so hard that when that ball on the top happened, and I killed the print, it took everything from that line above with it! Holding it together with my fingers for the picture. After that it starts getting real sketchy. The middle arrow shows a mildly-failing layer, but the second arrow from the top shows it really went downhill for a number of layers. I'm assuming the balling at the top was part failure or could have had something to do with the geometry it was trying to print. Only other clues I can give is that a clicking occurs. Things I have checked: - Top right hand screw that holds in the bearings and hob is on only very loosely (just tight enough to not come undone, with anti-vibration washers). Learnt this early on that it can make things skip! - Big and little gears are flush on the side that faces the heatsink. - PTFE tubing (meant to be 23mm) is slightly too short. I did have it slightly too long originally and it jammed things up. - Filament does indeed seem to be going close to the centre of the hob. Wouldn't say it's dead centre but it's close. - Not sure on the best pressure to apply to the filament for printing but it seems adequate. Possibly I could have too much? I'm not sure... Could this be possible? So I have done a fair bit of troubleshooting now and could probably assemble and disassemble a Titan Aero blindfolded. Please, someone help me!