I've never worked with PLA before, so it's entirely possible I'm just doing it wrong... I have a reel of SainSmart 1.75mm PLA in Fluorescein green. I can get a great print, but only once. When I go to do another print it's completely jammed and I have to clean it out (some times take it apart) to get another print. I let the unit cool between prints and I'm wondering if I should do a massive retraction at the end of a PLA print to keep the nozzle from getting clogged.