This is a remix of mitrasmit's remix of mobilow's Center Finder. Now you can customize the Simple Centerfinder to your needs.
3D Models created using OpenSCAD version 2016.10.05 with the Customizer enabled.
Under "Things Apps Enabled" click on "Open in Customizer".
Modify the parameters as you like to customize your Center Finder.
When everything looks good click "Create Thing" to create the .STL.