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Experienced 3D printers will note this project requires minimal post print processing. Do inspect prints for stringing and remove fine stringing with heated air. Remove burrs as needed. 3 mm bolt passages are easier to use if one runs a 3 mm drill through them before assembly.

I have intentionally designed to allow operation without tight tolerances. Nearly the entire Bunny Science PAPR runs under positive pressure making even FDM manufacture practical.

Consider lapping the top of fan flange so bag filter 22 mm adapter seats more cleanly.

Fan attaches to its mount and flange via M3 screws and nuts. Length of screw should be 5 mm longer than fan thickness.

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