da Vinci 1.0 cannot print PLA filament
The answer to this specific instance appeared in the comments:


  Also, a thorough cleaning of the nozzle/hotend might also be a good idea to get rid of all the stuck ABS residue inside. – 0scar Mar 26 at 8:44
  
  The problem solved !, my ABS is stuck in nozzle !!! – 3ORZ Apr 25 at 6:52