Printer: Alunar M505 (Anet A8 clone) Slicer: Cura Firmware: Marlin Nozzle: .4 Filament: 1.75 PLA Slicer settings Layer height: .2 Print temp hatchbox: 200 Print temp inland: 220 (it recommends 215-230) Speed: 40 m/s (I've knocked this down to 30 before) Retraction: 0-2 mm Exact E3d V6 i bought https://www.amazon.com/gp/product/B00NAK9L6Q/ref=oh_aui_search_asin_title?ie=UTF8&psc=1 Settings and printer album https://i.imgur.com/AxOoFwD.jpg (overview) https://i.imgur.com/ueURrD7.jpg (overview) https://i.imgur.com/LMgQo9G.jpg (new nozzle) https://i.imgur.com/vIuleHF.jpg (hotend) https://i.imgur.com/ehX35nV.jpg (hotend) https://i.imgur.com/3wZGWJg.jpg (hotend w/out fan) https://i.imgur.com/vrBE1b4.jpg (extruder) https://i.imgur.com/VqX0aoU.jpg (extruder) https://i.imgur.com/yKldZhk.jpg (extruder) https://i.imgur.com/EYrKdaq.jpg (cold pull) https://i.imgur.com/hluMEcS.png (settings) https://i.imgur.com/6WBwAuW.png (settings) Some of the prints https://i.imgur.com/EKR6JY7.jpg (most recent this morning) https://i.imgur.com/cNFgsmk.jpg https://i.imgur.com/QJUpTuG.jpg https://i.imgur.com/bfzsvll.jpg https://i.imgur.com/jfgvBZE.jpg https://i.imgur.com/cI098Z6.jpg https://i.imgur.com/XcmjN2e.jpg https://i.imgur.com/guYAoxG.jpg https://i.imgur.com/JDH7fdR.jpg https://i.imgur.com/c45CWhu.jpg https://i.imgur.com/k2mgSB4.jpg I purchased a genuine E3D V6 bowden about 8 months ago and I've been having under extrusion issues ever since. It's a bit random and I'm at my wits end. Sometimes it will print just fine, other times i can't even get the first layer down. Sometimes it will completely clog, other times it will only partially clog for a single layer. There is no consistency. The printer is fairly modified, bigger PSU, pi running octoprint, glass bed, mosfet, 40 mm extruder fan, auto bed leveling, remote extruder. I just swapped out the nozzle this morning hoping that was it but I still had under extrusion. I did a few cold pulls last night that didn't appear to have any debris. Things I've tried. Upgrade extruder fan to 40 mm. Worm gear for extruder. 2 different brand of filament, 3 different rolls. Baked my PLA. Measured extruder steps at least 4 times, it's spot on at 50 mm. ANY suggestions, no matter how big or small, are welcome. I've been battling this for months now and I'm almost ready to just get a different hotend. EDIT: I don't know how to have my imgur albums not show up as media. I'm trying to link them but it keeps converting it to a media. EDIT2: i've resorted to linking the individual pictures.