Where are you located, as in what country? That will probably change the answer a lot.
I would advise finding a local nerd to print it for you rather than using a commercial print service. For functional parts, it may take multiple attempts or some fiddling to ultimately get it right, which is going to be a massive pain in the ass if you're ordering parts by mail and paying for each one.
A local individual is a good idea, unfortunately I live in a very rural farmland area, not many "local nerds" to speak of. But I could do some traveling.
There's a very popular YouTuber that does his 3d printing on his goat/sheep farm in rural Sweden (I think that's where). Point is, you don't know who has a printer. I personally drive around a lot for my work and would certainly be willing to drop something off if you're in Indiana and I can. Just post the nearest bigger city and see if anyone responds.
That's a fair point. I'm a fair shoot off Indiana, unfortunately. There appears to be someone else in this post that wants to help! If that doesn't work out I will ask my husband to get on Facebook and post on one of those forums there. Thank you. (=
For use in a vehicle I would definitely recommend printing out of ABS at minimum (which is what most OEM plastic car components are made out of anyway, at least the ones I've looked at in my life that were marked as such on the back), so you'll need someone who can do that with their machine also. PLA and probably even PETG will deform in a car sitting in the sun.
I'm probably not local but I am a nerd, and my machine can indeed print ABS. Post the file and I'll take a look at it?
It looks like ABS was the recommended material on the forum that the part was posted on. Here is the forum it was posted on and here is the Thingiverse page for it. It would be the "modified" file, out of the two listed. I am not sure about how the specifications work, like measurements, but it would be meant to fit a 6.5" car speaker if that makes sense. I know just about nothing about 3D printers.
Doesn't look too tough. I'm quite certain I could print that out of ABS for you. Any color you want as long as it's black (which is all I have in stock right now).
Re: the dimensions. .STL files inherently have their dimensions baked in, as drafted by the designer. If you print it straight up without modification it will come out at the dimensions at which it was designed.
Ah I didn't know that about the file! That's good to know, I just remember seeing files before that said something about metric vs imperial, but maybe I am mixing up something else.
Would it be alright if I message you about the part? I really appreciate the offer.