This little plastic part was broken when I bought my (used) 2002 Chevrolet 1500HD truck. I decided to use my 3d printer to create a replacement.
This part holds the rear seat drink holder/cup holder in the upright position.
I could have bought the part at my friendly neighborhood GM/Chevy dealer for $20 or $30 or something like that. Instead I used a $600 3d printer and spent an hour or two designing and printing the part myself using a negligible amount of ABS filament. I chose the latter approach because it was more fun, obviously.