Requires 4 magnets 25x10x3mm . I made this for my custom 3D printer enclosure.Print the 3 components. Make sure you print with flat surfaces on the bottom to avoid unnecessary support structures. You might need to rotate the cap and bracket parts 180 degrees. Place 3 magnets in main holder and glue the cap on top. Mount the holder in enclosure with 2mm screws. Mount the bracket with 1 magnet inside to the door with 3mm screws. Magnets must be loose inside the holder and door bracket to align to a best-lock positions when door is closed. Make sure when gluing the cap not to glue the magnets to the cap. Use less magnets for a weaker lock - just fill the remaining space with light foam. Magnets have polarity - make sure when installing magnets they will "attract" to each other !