Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4897236.

It's a pullout tray for the pen pocket hole in the Dango bifold pen wallet.

Extra Materials Needed: 2 4mm x 1mm magnets 1 4mm x 3mm magnets

You'll need to superglue the anchor to the magnet end of the tray and the endcap to the other end. I had to shave some material out of the rectangular hole to get the endcap to fit.