Print a Skirt and Nozzle Holder the appropriate size for your printer. The A and B variants are mirrored for installation on opposite sides of the printer.
Install the 2 heat-set inserts into the ends of nozzle-holder part.
Install 1 magnet in the skirt, and one in the nozzle-holder such that they attract eachother when the door is installed.
Insert the door into the skirt part and fasten with 2 M3x8 BHCS
Remove the stock skirt piece and install the new one in it's place.
The most recent version of this mod can always be found on Github