A few years ago I purchased a Whynter Portable AC/Heater for my deck. The included window brackets never fit quite right, but I made finagled them to work. When COVID-19 hit, I ended up moving this unit to my home office as it is always several degrees warmer than the rest of our house. Again, I had fit issues with the plastic window vent frame, the summer of 2020 I bought some foam insulation board and cut it to fit the hose mount. This worked so-so, but I was never very happy with it.
After purchasing a Prusa MK3S+ 3d printer, I decided to try my hand at designing a box/frame system that would allow me to easily fit both my interior window and my deck window. So in the winter of 2020-21 with the help of TinkerCad, I designed a series of interlocking rectangular boxes/wings, and rails. I ended up with what I think was a really great design, and I used this new box throughout the spring, summer, and fall of 20221.
As a long time Thingiverse user, I decided to share the designs with my fellow makers. After many long delays, and spending some time to make pictures and verify which STL files to include, I am happy to announce that I have submitted my first public design to Thingiverse for my portable AC window slide box. You can find it here: https://www.thingiverse.com/thing:5257561
Below are some of the CAD images