THIS IS A REMIX
Slightly improved model of air filter for W123. Modifications are shown in *.scad files

True Author is unknown to me. I've got the original model here https://drive.google.com/drive/folders/1BMMEnbAfx0UBP-UhUZQeCHwmkM8z1LVd
Author claims that WIX WP6852 fits it. I've used CU1313 by Mann.

Unfortunately I cant mark it as a remix, because I'm unable to refer sources