Delica D:5 Rear Window Air Vent

I love my Mitsubishi Delica D:5 campervan... but, being a small vehicle, it can get a bit warm/stuffy in there especially during summer. The solution is, obviously, to open one or more of the windows a little for some fresh air. While NZ does not have any snakes, bears, or other predators that want to kill/eat you we do have something even worse - the sandfly. Those little buggers will swarm in their thousands and do their very best to make getting a good nights sleep nearly impossible (and, if you do get to sleep, you'll most likely wake up with bites over any exposed bit of flesh)

My solution... to design (with the help of Gemini) an insert to go in the rear sliding door window which allowed airflow while keeping the bugs out.

After taking a bunch of measurements and drawing a couple sketches, I supplied these to Gemini which did a pretty good job of generating an OpenSCAD script to make what I needed. I added a few extra parameters in case I needed to adjust anything (or adapt it for different vehicles)

Since it is going in a vehicle which is likely to get hot and be exposed to the sun I would suggest printing in PETG or ASA.

The original PLA prototype came out perfectly but then when I tried to print in PETG I ended up with some stringing on the overhangs and some other top layer issues on one part - but it will do for now (I suspect maybe the filament needed some extra drying, plus some additional tweaks to the settings).

This prints in three main parts (left, centre, right) plus three retainers for the insect mesh. Printed on a Creality K2 Plus (not sure if the main parts would fit on a smaller bed or not)

I glued all the bits together using JB Plastic Weld (but might need to screw the main parts also for extra strength - we'll see how it goes).

FYI - this does assume you have weather shields on the windows to keep any rain out. Shouldn't be too hard to add some louvers over the vent holes for the same purpose if you don't have weather shields.