When your model is printing there are two settings that you need to be aware of because they can make the difference whether or not you have a file successfully print as a model.
Rafts – a raft is a horizontally printed layer of latticework that is printed under you object to offer support and it adheres it to the build plate. Most prints do better with rafts, and they can easily be peeled off when printing is complete.
Supports – are columns that are generated to keep your model in tact while printing usually for models that have overhangs. You can think of them as scaffolding that can offer support but it does not have to only be on the perimeter of the model. They are thin and wispy and can be clipped off once your model has printed.
Example in need of a support