HEPA filter for 120mm fan

thingiverse

This is my take on a HEPA filter that's printable on smaller printers, like the Finder (140mm limit). The filters used are the Kenmore 86889 - which can be quite difficult to source in Europe. My advice is to split the hepabox into two parts, right through the middle and print twice. Each print takes about four and a half hours. This design requires no struts and allows it to be printed on printers with smaller work areas. Printing in two parts also makes it easy to insert and couple the two parts together once the filter is removed: simply slide one part in and then slide the other part into place until closed. You might need to remove the rubber or silicone gasket to do this. The fanbox is designed for a 120mm fan, with no holes so you can either tape it or create your own after printing. This design was first uploaded and made using OnShape software. You can find more information on YouTube at https://youtu.be/lS7U-6CLIK0 Print Settings: Printer Brand: FlashForge Printer: Finder Rafts: Doesn't Matter Supports: Doesn't Matter Resolution: 0.25 Infill: 0.15 Notes: The HEPA box takes about four and a half hours to print, each side. The fanbox takes around nine hours to print. If done in two pieces for the box, no struts are needed - neither is any support required for the fanbox at all. Depending on your fan and fanspeed, you may need a shroud to compensate for negative pressure.