FreeCAD Parametric Springs !

Thanks to @Razzer09 and @3DPrinty for reminding me to have a go at parametric springs …
https://www.printables.com/model/534644 
https://www.printables.com/model/282561 

I was pleasantly surprised that parametric modelling on FreeCAD works quite well. While not having the power of a full Excel spreadsheet (as SolidWorks), the common maths functions one might need are possible, and it all feels correspondingly less heavy. Referencing the parameters into dimensions is a bit more clunky, but there's an autocomplete which makes things easier.

Notes

■ Each spring end-style has a separate FreeCAD model - scroll to the bottom of the models list to find them

■ To edit parameters in FreeCAD look for the spreadsheet inside the model tree

■ Some combinations of parameters won't work. Look out for red exclamation marks in the model tree. Note that on FreeCAD, if the model fails to build then the 3D image will still show the previous ‘good’ geometry.

■ Print these springs on rafts

■ I've printed them successfully in budget PLA, although the strain (stretchability) is limited. 
   For best results use a resilient material

Update 07/01/2025

I've updated the FreeCAD model  “Compr_Spring_Pad-Ends_20250107”  to fix an error spotted by Gábor Dániel Kormos (thanks!). The model failed if (H > Wp), but it's ok now.