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Changes to Step #18

Edit by Guy Kuo

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[title] 3D Parts Post Print & Assembly
[* black] Experienced 3D printers will notice this project requires minimal post print processing. Do inspect prints for stringing and remove fine string with heated air. Remove burrs if needed. 3 mm bolt passages are easier to use if one runs a 3 mm drill through them before assembly.
[* black] I have intentionally designed to allow operation without too close a required tolerance. Most of the HALO respirator runs under positive pressure and is not involved in gas sealing. Bag does most of the work.
[* blackred] There is one place where poor fitment will reducereduces fan efficiency. Lap the bottom of the fan flange so it seals well against fan body.
[* black] Lap the fan flange base so it can seat tightly against fan body. A gasket of silicone around fan interface with the flange is a reasonable precaution, but probably not needed if you lap the flange base flat.
[* black
green] Fan attaches to its mount and flange via M3 bolts and nuts. Length of bolt should be just over 5 mm longer than fan thickness.
[* yellow]
A single 10 mm M3 bolt and nut attach fan mount to halo.
[* blackred] There is one place where poor fitment will reducereduces fan efficiency. Lap the bottom of the fan flange so it seals well against fan body.
[* black] Lap the fan flange base so it can seat tightly against fan body. A gasket of silicone around fan interface with the flange is a reasonable precaution, but probably not needed if you lap the flange base flat.
[* black
green] Fan attaches to its mount and flange via M3 bolts and nuts. Length of bolt should be just over 5 mm longer than fan thickness.
[* yellow]
A single 10 mm M3 bolt and nut attach fan mount to halo.

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