This one took me way longer to make than I thought it would, but it was totally worth it!
Step file is meant for a color change at 4mm high, but you can also take the SVG or DXF and make your own, several slicers support that now.
If you want a version with pockets for magnets or anything, just let me know, it's easy to modify.
The author marked this model as their own original creation.