Magnetic Airduct

I was fed up in mounting and remounting airducts, with those tiny little screws that tend to slip and drop into a temporal blackhole, so I decided to take advantage of the bed level sensor magnet.

This mod ads a 10x10x2 mm placeholder that makes the duct screwless (you can still screw it if you want but then again why bother with this mod ?). Of course if you wish to use the bed leveller you need to snap off the airduct, but you do not need airflow to level the bed ... so it seems perfect t