The idea came from the octagonal spring of “nokiri”. This spring is very practical, and I have used it in some of my designs

just in some cases, a square type would better fit in the design, also bigger and stronger are also required, so I have adjusted the parameters

some parameters for the spring design

• Shape: Square & Hexagon
• Dimension: 20(W) x 20(L) x 20(H) mm
• Thickness: 1.6mm

• Loops: 3 / 4 / 5

  (fewer loops, stronger resilience)