image = Tri-joint-thumb.png |designers = Popular Mechanics crate advertisement |date = 1923 |vitamins = |materials = |transformations = |lifecycles = |tools = [[Wrenches]] |parts = [[Frames]], [[Nuts]], [[Bolts]], [[End caps]] |techniques = [[Bolting]] |git = |files = |suppliers = |reversible = true

Techniques

=Introduction= Three-sided overlapping joints, tri-lapping joints, or tri joints join three frames together rigidly in all three [https://en.wikipedia.org/wiki/Cartesian_coordinate_system cartesian] axes by securing each with a bolt. This unique joint requires only frames, nuts, and bolts, and is the basic technique for building rigid structures from frames used throughout Replimat.

=Challenges=

=Approaches= All possible tri joint configurations are represented in each tri joint, and accessible via simple rotation or reflection.

Rotations