Installing a portative AC exhaust on a lexan sheet I realised that a bird could enter exhaust to do its nest or domething else...
I then designed an AC Exhaust grill. It screw right in the OE Exhaust and sandwich the lexan.
Printed facedown with minimal support
I used PETG,1.2mm wall1.2mm Top/Bottom0.2 layer height
Tested for months, works perfect
Feel free to reach me on my Facebook page : https://www.facebook.com/OfflimitsRC