If you've downloaded my K1 Max Magnetic Door Seal https://www.printables.com/model/860107-k1-max-magnetic-door-seal and aren't interested in using 3M tape to secure the top and bottom magnets, this is the solution.
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The diameter of the hole for the magnet is 10.15mm and has a height of 6mm. These dimensions are to press fit two 10mmx3mm magnets.
-Tape
I've included the .STEP file in case anyone wants to make changes for different sized magnets.
The author remixed this model.
Added a space to press fit a magnet under the nut.