Geeetech Prusa I3 pro W User Manual page 24

Generally, most 3D models will print with overhanging parts by up to a certain degree. The
angle is determined by several factors, most notably layer height and extrusion width, and is usually
around 45°. For models with larger overhangs, a support structure may have to be printed below it.
This incurs the use of more material, longer print times, and post-printing clean-up.
a. Generate support material
Some models have overhanging parts, which means that parts of the model float mid-air when
you would print the model. In this case you must use a support structure under the model to prevent
the plastic from falling down. This can be achieved by generating support material. Select this
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support (the blue part)
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