backdraught shutter
thingiverse
Not printed yet. They're only six pounds to buy, but I thought I'd give designing one a go. One hundred millimeters in outer diameter, ninety-four millimeters in inner diameter; the shutter opens up to about thirty degrees. You'll need some two-millimeter diameter rod or solid core wire for the pin - for example, a two-millimeter pushrod (which I have loads of).
Download Model from thingiverse
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