Often times the nozzle on the 3D printer becomes clogged or broken and needs to be replaced. You will need to repair your nozzle when you have prints that are consistently failing. You need a clean nozzle to be able print smooth and even surfaces. You will need heat resistance gloves to do this repair because the nozzle will be in excess of 250 degrees Celsius. A 6mm hex wrench is required to do this repair, but it should be included when you purchase your printer.
Plug in the AC Power adapter and USB cable into the back of the printer.
Turn on the printer and initialize it.
Open the UP! software on your computer, and bring up the "maintenance window."
Under maintenance, click "extrude."
Then, verify if the nozzle temperature is rising by looking at the status box in the same maintenance window.
Using the 6mm hex wrench, apply force by pushing up to lock the nozzle into the wrench and turn counterclockwise to loosen the nozzle.
Attach the new nozzle with the hex wrench by screwing it on in a clockwise manner.