MPMD Simple Magnetic Draft Shield

I had designed a magnetic holder that attached to a snap-on holder but decided that the design was overly complicated. Instead I designed a simple, single unit, magnetic holder that holds a piece of cardboard over the MPMD opening. 3 clips can be used to cover all the openings. I used a piece of cardboad that is about 3mm thick. I have included a 1, 2, 3 and 4mm design in case you wish to try some other materials such as Corex or a thin clear plastic.
I glued in a single 12mm diameter neodymium magnet to attach the piece to either the top cover (hangs down) or the bottom cover (sits up.) If you only use it on the bottom it probably doesn't need to be glued in.
Since the extruder interferes with the top area of the MPMD on one side I found that having the clip sitting on the bottom worked best for me. By trimming the cardboard I was able to close up most of the gaps.

It would be easy enough to redesign the clip to hold a piece of flexible material in a slight curve in order to