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Changes to Step #18

Edit by Guy Kuo

Edit approved 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.
[* icon_caution] In the fan powered configuration, there isblack] There is one place deserving special care. The portion betweenwhere poor fitment will reduce fan efficiency. Lap the bottom of the fan and viral filter is under negative pressure. We do NOT want a leak entraining air thereflange so it seals well against fan body.
[* icon_caution] In the fan powered configuration, there isblack] There is one place deserving special care. The portion betweenwhere poor fitment will reduce fan efficiency. Lap the bottom of the fan and viral filter is under negative pressure. We do NOT want a leak entraining air thereflange 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] 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. A single 10 mm M3 bolt and nut attach fan mount to halo.