Plastruder MK5/6 Tensioner Spring

This is a spring designed to reduce the stiffness of the thumbwheel tensioner system to make the pressure on the filament and drive wheel more consistent.

The spring is designed to be made from 1.6mm 2024-T3 Aluminium

I have FEA'd it to check stiffness (about 40N/mm) and yield strength (more than sufficient, I think!)