peng-shao

Hi all, I am excited to get a new Ultimaker 2 back home. I printed 3 models so far and still doing the fine tune for the bottom layer. The bottom layer is very coarse now, but other layers are pretty good. (i am using z resolution of 0.02mm and bottom layer with 1mm) Last night i met a problem. After i start a 40 min job, i went back to sleep, but this morning there is nothing on the plate, the LCD shows jobs done. Is the nozzle been blocked? Anyone have seen this problem before? Thanks, David