200x200mm Bathroom Vent Door Cover

Overview

Have an exhaust vent that pulls too much air? Do I have the solution for you!

This vent cover can be opened up to 2/3 of the full circle using a pair of 'fans' (as they're called in the file names....in hindsight 'shutters' would probably have been a more appropriate phrase), two pieces of housing, a knob, and a decorative ring that cleans up the design.

There are two housing options, one that is 200x200, and one that is 200x140 - my bathroom vent is offset and not full width so I had to remove part of the housing to suit. Use whichever version suits you, or download the 200mm version and split it in the slicer to suit your needs.

Suggested Print Settings

Print with whatever settings you want, but I'd recommend at least 3 walls to ensure enough strength along the screw axis. You will need to use supports for the housing centre hub, which should be printed face-down (with the cavity for the 'fans' faced upward).

I liked archemedian cords for the top and bottom surfaces of the 'fans' since to my logic they should move more smoothly against each other

Assembly

You will need to print one of each of the STLs and secure it with an m3x16mm screw. At least one m3 nut is required, however I suggest two to prevent it loosening over time.

Assembly should be completed in this order:
1. Place the Housing facing downward on a table.
2. Front fan placed with the locking nubs downward, align the rotation-limiting nubs with the grooves in the housing.
3. Back fan placed with the rotation-limiting nubs faced downward to interface with the cut-outs of Front Fan.
4. Align the Rear Spacer with the notches in the housing, ensure that the cut-outs align with the nubs on Back Fan.
5. Insert the m3x16mm screw through the Knob.
6. Pinch the housing and 'fan' assembly and turn it over. Place the Knob Spacer over the centre then align the knob and screw and press together.
7. Using an allen key to turn the m3 screw, draw the nut into the Rear Spacer. Do NOT pre-press the nut as there is a risk of miss-alignment, pulling it into place ensures an aligned nut.
8. Adjust screw tension until the assembly is snug but the fans flip freely.
9. (optional - recommended) add a second nut and tighten it against the first, this has a locking effect. 
10. (optional - if you're nuts like me) add a dab of super glue or loctite to ensure the second nut never comes off.
11. Apply double-sided tape in the groove around the perimeter of the back of the housing.
12. Press against your bathroom vent.
13. Enjoy!

License/Reposting/Commercial Use

I am a firm believer in free and fair personal use. If you want to change it, go for it - it's definitely a little utilitarian in its current state. If you want to make one as a one-off for a friend and charge them for your time and filament....go for it, but please post a make. For any large-scale production or mass-sale, please reach out first. Chances are, unless you're charging an exorbitant amount, I'll say go for it.