These fit 90% of valve stems. The difference is actually the type of filament you use and other settings. Most filaments tend to shrink, some don't. Start by printing just 1 for a test fit. You can then shrink it if needed in 5% increments directly in your slicer.
This is a remix from a model I found on another website. I remade them so the threads would fit cars/trucks. A lot of the models on here don't fit. I edited using my very own design, "make anything you want tire caps". I also made the model slope up from the stem so one doesn't need supports. Anyway.. Enjoy!!
Check out my other design I mentioned above. You can make any 3d model into a car/truck valve stem cap simply on Tinkercad.com. (I include step by step instructions so even if you're not familiar with TinkerCad or any 3d modeling, you can do this).
car_middle_finger.stl | 701.8KB |