These two files encapsulate this HEPA filter for particulate filtration exhausting a 3D printer or laser etcher enclosure and fits securely on the end of an AC Infinity CLOUDLINE PRO T4 and AC Infinity 4" ducting.
For the hose pass-thru I used, see here:
Passthru for 4" ducting by Aviator4x4 | Download free STL model | Printables.com
I printed these out of PLA with 3 walls, 3 top shells, 3 bottom shell, 15% grid infil and they came out pretty much one solid piece of plastic. After 5mo I'm uploading this as a success.
No supports were necessary. Overall, fairly easy/benign print.
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The author marked this model as their own original creation.