I got the dual extruder with laser model from amazon. When i opened the carton a long sharp pointed wire was slipped in the hollow of the corregation of the box flap. I pulled the two sides open and the pointed wire flicker d out and stabbed me in the lip..it broke the skn, it bled. This wire rod ground to a sharp point bibo tells me it is for clearing the nozzle ..amazon tells me the packaging method to cause this dangerous rod poised to fly out in your face is checked by amazon and is approved by amazon! Good thing it did not stab me in the eye. I do worry that because the package comes from china that i may have been contaminated or infected with something. I sent the package to the US CDC for investigation. And so far, amazon refuses to refund me the 700 bucks! The CDC will not return it to me even if i did want it back".....So.....I am OUT 700 bucks and have a swollen lip