Hello. I do not know English well, so I translate through Google translator.
You can take the video
as a basis. It shows that a conventional printer can print overhangs at 90 degrees without support. In the picture 1 is the figure that we print. Picture 2 shows how the layers really go down without supports.
I am not a programmer, so I don’t know if it’s possible to add a mode from picture 3. The principle of operation is that layers of red color are printed to a height of 1.5mm from the beginning of the overhang. Further, the printer simultaneously lays blue layers with 3 axes at an angle to the surface of the red layers. The angle from the vertical is not less than 45 degrees. Perhaps a larger angle will reduce the possibility of sagging layers. after the completion of the blue layers, the usual printing of the green layers follows. Picture 4 shows a larger angle of inclination. The print speed is reduced and cooling may be turned on at 100%.
Height no more than 1.5 mm? the most common e3d nozzles have a protruding end height of 2 mm and an angle from the vertical of 35-40 degrees, so the angle of the upper layers is at least 45 degrees, possibly more.
Is it possible to add such a feature in a future slicer update?