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I had some issues with my UP box at first. Some observations that worked for me: 1) DO NOT USE THE UP SOFTWARE FOR MAC - ABSOLUTELY NOT! The only version actively supported is the windows version; 2) Make sure the raft is printed correctly. If something happens to the raft, stop the print and start again; 3) If the nozzle is to low (with me so far, it was never too high), set it in increments of 0,1 mm until the raft prints ok; 4) make sure you followed all the instructions for mounting the printer according to the user manual. After these observations, I've obtained 100% success on my projects.