Anet A8 extruderfan upgrade

I first used the fan modification from hadoko (https://www.thingiverse.com/thing:2290361), but the hook to hold it close broke soon and i thought there must be a more robust solution.
So i designed this fan modification where i included two chambers for neodym magnets to hold the door with the extruder fan with its heatsink closed. The magnets are round ones with 12mm diameter and 2mm thickness.
If you have different magnets, search in the freecadfile for two boxes called "magnetraum".

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