A parametric buckle for connecting and tensioning two flat lines. The knot shown in the picture slips in one direction only - if you apply tension to the inner of the two line ends. If the tension is equal or larger on the outer line, it is self-locking.

Not safe for any purpose, but I tensioned mine (10mm bars, solid print) up to some 5kN.

Parameters:

• Line width, bar diameter, overall length, tolerance
• Offset from center (working with thick lines requires more spacing in the center)

Adjust scad file, print, buckle up.

The STL provided is good for a 30mm line.