Reasons Parts Fail (MakerBot)
There are a variety of reasons why a part may fail on the MakerBot. It is important to monitor the print regularly in order to catch potential failure. This page will list a few reasons why a part might fail and how the problem can be resolved.
One of the most common causes of a failed print is stuck filament. When the filament gets stuck, the extruder no longer has any material to work with, and will continue on printing nothing. It is hard to catch this before it happens without sitting and watching the entire print (which is a waste of time). If this happens, stop the print and ensure the filament is feeding in such that it will not catch on anything when you attempt the print again.
A clogged nozzle will make the printer unable to extrude more plastic. To check if the nozzle is clogged, go to the LCD menu and run the Load script in Utilities > Change Filament. If the plastic curls up toward the extruded, the nozzle is probably clogged and needs to be unclogged.
If the nozzle is clogged, you should probably ask a mentor to help you fix the issue, but here are the steps you can take to fix it.
If this process doesn't work, wait until a mentor can come help you fix the problem.