This is a low cost alternative for an exhaust fan for the Printed Solid Enclosure - Prusa MK3s box.
This makes use of an off-the-shelf HEPA filter and 50mm fan.
I recommend using PETG or ABS type materials for printing these parts as it can get quite warm in side the enclosure which could cause PLA parts to warp or deform.
No supports are needed.
Recommend you use the perimeter and brims settings in the 3MF files.
Print 1 copy of each part.
The filter is (was) available on Amazon here:
https://www.amazon.com/gp/product/B00328IAO0
Mfr: 3M P100 Particulate Filter For 5000, 6000, 6500, 7000 And FF-4 (110cm diameter)
Fan on Amazon
https://www.amazon.com/gp/product/B07Q1X29J9
I used a 5v 50x50x10mm fan. You might want to look at 12V fan with a bit more CFM power.
You will need M3x18 (or 20mm long) screws with hex nuts to mount the fan assembly to the enclosure. This makes use of the semi-precut hole provided by PrintedSolid on their enclosure.
The author hasn't provided the model origin yet.