Summary

I needed a nitro engine filter for my RC cars and planes. I could not find a large block filter, so I decided to design my own.
These print with no support. I am using flexible TPU from COMGROW sold by Amazon, very affordable.

https://www.amazon.com/dp/B0DF4TY2GD?ref=ppx_yo2ov_dt_b_fed_asin_title

This material is very flexible and strong for this application.
I printed both on my Elegoo Neptune 3 FDM printer, 20% infill - 205 degrees hot end - 60 degrees bed, and they came out really good. Since I decided not to use any support, there is a minor overhang on the inside of the filter housing - it is minimal and will not affect its functionality. They fit snug in place but a tie wrap is recommended.

There are two versions included, the thick wall and the thin wall. Enjoy.