Convex/Concave/Straight Overhang Test

Not all overhangs are created equal. The print quality of an overhang depends not only on the overhang angle, but also on whether the overhang surface is convex, concave, straight, or a sharp corner. This test part features all of these variations. The overhang angle starts at 15 deg. and goes up to 80 deg., with graduated markings at 30, 45, 60 and 75 degrees.Types of Print DegradationThere are two different types of print surface degradation that occur with overhangs:Convex curves (from smooth curves to sharp corners) tend to curl up. This is because the filament is actually stretched as is is laid down, and if it is not connected to much below it, the stretch will cause it to curl up. The sharper the radius, the more the curl. The greater the overhand angle, the more the curl.Concave curves tend to delaminate horizontally. Again, because the filament is stretched as it goes down, if it doesn't have enough below it to stick to, it will be pulled taught, creating a "shortcut".Straight