Leave a note on the fridge with a bit more aggression with this katana magnet. It uses two 6x3 magnets.

Profile is four plates -  1. Hilt, 2. Blade, 3. Blood Drip, 4. Slash Mark. I have the blade set up to swap layer colors after the initial trim around where the blade comes out if you want to personalize it more. Just remove the supports and slide the blade in to the hilt. Fitment is tight to avoid needing glue. Then just press your magnets in, but I would add a dap of glue on them to help keep them from sticking on the magnetic surface with repetitive use. Optional blood drip can just slide right on and optional slash marks can be printed and used as sub-magnets to hold up more things around it. Slash uses 3x1 magnets.

Set up with PLA, but if you got PETG since object strength it low in order to keep it light, I'd use that.