Bridges

A bridge is a horizontal span connecting two vertical supports. Most printers can successfully bridge distances up to 10-15 mm without significant drooping. Longer spans require specialized settings or supports. Longer bridges are possible, but may require part specific fine tuned settings, cause higher scrap rates, and cause cosmetic issues.

It is critical to orient the part so that bridges are parallel to the X or Y axis (or the direction of the print head movement). This allows the nozzle to lay down a continuous bead of filament, which is stronger than a bridge laid perpendicular to the print head's path.

For very long bridges, consider incorporating an intermediate support feature or a “self-supporting arch” into the design. An arch is composed of multiple smaller overhangs that are all within the 45-degree rule, eliminating the single long bridge and the need for supports