=Introduction= A truss consists of frames connected at joints. Trusses are typically composed of triangles because of the structural stability of that shape and design.
=Challenges= A triangle is the simplest geometric figure that will not change shape when the lengths of the sides are fixed. In comparison, both the angles and the lengths of a four-sided figure must be fixed for it to retain its shape.
=Approaches= <gallery> Truss-simple.scad.png|Simple truss Truss-spacers.scad.png|Truss with spacers or stacked washers Truss-craftsman.scad.png|Truss with tri joints </gallery> * 2, 3, 4, 5 wide for similar function as 2040, 2060, 2080, 20100 extrusions. bolted across in an alternating diamond pattern for widths > 3 and bolt-length of 3.
=References= * [https://en.wikipedia.org/wiki/Truss Wikipedia: Truss] * [https://en.wikipedia.org/wiki/Space_frame Wikipedia: Space frame]