For many years I had a rather long daily commute and, while I appreciated the wonderful interior of my Volvo XC90, I was constantly annoyed, on long stretches of my morning commute, by having the sun shine directly in my eyes and not being able to do anything about it as the car's sun shade seemed to have a gap exactly where the sun was coming in.
In a pause between jobs in 2019, I started a new hobby: 3D printing, and soon enough I found myself tinkering on how to "close the gap". This was the birth of my first product, the corner shade (picture shown here).
One of my initial customers suggested an extensible sun shade for when the sun shines from the side and is not fully covered by the sun shade, the side extender was born.
Since then many drivers in Europe and North America are happy users of these two products. You can find a few pictures and comments on this forum.

An early prototype on my first XC90 that had the beige liner