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Comment by aftbit | Hacker News Reader

Thanks for sharing this! Can you provide the values of the variables for that exact linked filter and fan? I'd like to print this while I wait for Amazon shipping. I bought ASIN B07GJG285F instead - same fan, but faster shipping for me.

  screwhole=5;     //fan screw hole diameter (5)  
  filterhole=92;     //HEPA filter hole diameter  
  thickness=1.5;  //Thickness of plastic layer (1.5)  
  insert=10;          //Length of insert into filter (10)

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You'll definitely want to bump thickness up to 2.0 mm for more rigidity. Otherwise just measure the diameter of your filter and maybe round up slightly.

I put a layer of electric tape around the flange where the filter adapter inserts into the filter and it makes a very nice airtight fit. Finally, just print it with the big end facing down and you shouldn't need any supports.

screwhole=5; // fan screw hole diameter (5)

filterhole=59; // HEPA filter hole diameter

thickness=2; // Thickness of plastic layer (1.5)

insert=10; // Length of insert into filter (10)

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