Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3271527.

Loved the original idea from Moksiu, but the STL wasn't printable through Cura. I redesigned the model from stratch to use two larger magnets (6.5mm diameter, 1.6mm thick), so this one is substantially bigger than the original, using about 10g plastic to print.

I rebuilt this in Fusion 360, primarily by eyeballing the original. I've included the parametric file to play with - you can adjust the magnet size in the parameters section to scale the entire design to fit a particular magnet size. I didn't carefully test this, and I'm sure it'll take a lot of adjustment to get it just right for your purposes, but it's available for you should you want it.

UPDATE: Added a less-angled 15 degree version to the files.