Maybe I can get some help here on the Ender 3 thread, I bought an Ender 3 a few weeks ago and screwed up a few prints at first and then figured out how to use it properly, I have been printing a lot of stuff with PLA and had great success but I bought this unit to print TPU for quadcopter parts so I bought some TPU and printed some awesome GoPro mounts, 2 to be exact and last knight I tried to print another one from the same sd card and it would not print anything beyond the first layer, I went so far as to change the nozzle and it does the exact same thing, prints the first layer and stops extruding, I received 2 more rolls of TPU today in the mail and tried them and still get the same result, I switched back to PLA and printed a test rocket and had no problem at all, the tried again and still only the first layer prints. WTF! I will try to make a video.