@fortinmike designed an excellent magnetic key box, which I modified to fit also non-US keys, as European house keys tend to be larger. (all credits to fortinmike for the original design!).
The position for the 8mm magnets remained unchanged.
The f3d project file is available for modifications.
The inside measures are now 30mm x 65mm.
Printed in PLA @ 0.2mm.
The author remixed this model.