This thing is a magnetic holder for a "CANARY" box cutter (https://www.amazon.com/CANARY-Corrugated-Cardboard-Cutter-Parallel/dp/B075FS764K/). It uses five 8x3mm cylinder magnets which are glued into the holes. Two of the magnets set in deeper to help hold the cutter, but the holder should be oriented so gravity helps hold the tool in (not upside down where it would fall out). I'd recommend using the stronger neodymium magnets with this (N52 if possible). I used them, and on my fridge, I can move the holder around, but it feels secure and I don't feel like it would fall off easily.

I printed this at 0.2mm resolution with supports everywhere, but used the Cura support blocker to remove supports from the area where the blade goes. It should not be a problem to just leave those supports, but there is no problem to print it without them either (would probably work with no supports overall just as well). It should also be possible to print this with the open end up which would also not require any supports.

I included the STP file for easy remixing.

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