I am a bit of a neat freak when it comes to my car. Throwing trash in cupholders irritates me. I made these mostly because my kids blow their noses all the time and they end up all over the back seat. This allows them to put them in these containers that easily unscrew and allows you to dump them later. I also made a small one for my front cup holder that allows the door to close still.

There's 2 different sizes, 81mm and 70mm. The 81 has a short and tall one. You pick which one you want to use and print it. The rubber star part is made of TPU, so you need to be willing to print TPU so you can put the garbage inside.

Building it is easy. Print the ones you need, put the TPU piece into the lid from the underside and the screw the ring with the dots facing up. This holds the TPU piece in place. Then screw the lid into the bottom part. It may take a few tries but depending on what you print it out of will determine how easy it is to get the screw part to work.

I printed it of PETG since it'll sit in the car with hot temps.

I also used Fuzzy for the cup parts, you can remove that if you want, but I like the texture and look it gives. Enjoy a cleaner car with these :-)