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.
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.
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.