I needed a spring for my helping-hands. I was using Steph_Nuggs' Functional spring, but found it difficult to print consistently with PETG, so I designed this one with support throughout. The concept is also similar to Springy springs by adie, but parametric.

I print with PETG using a .4mm nozzle and PrusaSlicer's .15mm quality preset, with perimeters bumped to 3. The clearance may need to be adjusted for .2mm layer height. 

Updated 2024/04/23: Added nsprings parameter to .scad file.