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Bathroom Scale Caddy
(midwest.social)
A handmade home for woodworkers and admirers of woodworkers. Our community icon is submitted by @1985MustangCobra@lemmy.ca whose father was inspired to start woodworking by Norm and the New Yankee Workshop.
I'm not sure how OP did it, but a dado blade set on a table saw is how I would do it.
You could also use a router.