If you have small kids in car seats, things can sometimes get messy in the car. Our kids like to have drinks, snacks, and toys with them on their car rides, so I designed a small tray and cup holder that can fit in one of the existing car seat cup holders.
There are 3 components - insert, tray, and cup holder. The insert fits into the existing cup holder. We have 2 different Graco car seats and the insert fits in both of them nice and snug. The tray fits over the insert and can rotate freely to easily move the tray out of the way when not being used. The cup holder sits on top of the tray and insert so you still have a cup holder.
I printed all parts in PLA Basic at 0.2mm layer height on the A1 Mini. The cup holder does need supports but the tray and insert can be printed without supports. I included the 3mf file and STL files. Let me know if you have any questions. Thanks!