I liked a bunch of the slim wallets I saw on Thingiverse, OpenBuilds, and Etsy (such as https://www.etsy.com/listing/267073299/wood-slim-walnut-minimalist-wallet-wood) so I decided to make my own. The file defaults to 3d view and no logo because that is what the online customizer can handle (in case you want to modify any of the measurements) but if you download the file, you can export a 2d file (SVG/DXF/etc) for CNC routing or add a DXF logo (I had a SVG file and downloaded the Inkscape plugin https://github.com/brad/Inkscape-OpenSCAD-DXF-Export as recommended at https://bohumirzamecnik.cz/blog/2016/how-to-make-stl-with-svg-logo-and-text-in-openscad/).

The printed wallet above is printed in ABS with epoxy to fill in the logo. The routed wallets are routed out of one of the $1 bamboo cutting board that could be found at the Dollar Tree for about 9 days before they sold out nationwide. The engraving font used was free from the bottom of https://mr-clipart.com/int/freestuff.php

The bands for all the wallets were purchased 12 for $1 at the Dollar Tree (6 silver, 6 navy blue).

Update: added portrait style .stl (just swapped the card_width and card_length values).