So you own a Mazda Miata / MX-5 / Eunos Roadster. Specifically a first generation NA. The best selling convertible in history and ultimately the best car to have ever existed. Congratulations!
You pull up to your local Cars & Coffee event. Everyone is in awe at your beautiful car. But there's one problem. You've lost your factory OEM cupholders, or if you're like me, live in a market where cupholders were never even an option. How are you supposed to go to Cars and Coffee with nowhere to put your coffee?! The factory ashtray is less than useful for storing coffee, or anything besides ash for that matter.

Here's my solution to this frustrating issue.
I've designed this from the ground up, taking inspiration from @bbeavis' version but starting from the ground up. This cup holder clips in perfectly, and doesn't rattle around AT ALL.
The cap inserts slot in nicely, and don't rattle either. Just the perfect amount of friction to stop them moving, but you can get your nail under the cap easily to pull it up.

I've designed this cup holder with 75mm diameter holes specifically for my 8oz KeepCup (no affiliation, but they are fantastic). At some point I'll add an insert to better hold a Red Bull can, and if there's interest I'm happy to add other versions with different diameter cup holes too.

Recommend printing in PETG/ABS and sanding & painting to give an OEM finish. The flat black Duplicolor Vinyl & Fabric spray cans are what I used and are near a perfect match to the OEM finish.

Designed to print both the cap and the body with no supports. Print face down.