Oh there are annoying pop ups and you might need to sign up for the website. But I just use a throw away email
What exactly is your design? If it is very specific then you might have to muck around in a 3D program. If its not you can probably find someone has already made it online either for free or a price and you can put it into the 3D program of your choice.
Example:
https://www.turbosquid.com/Search/3D-Models/free/case?dd_referrer=https%3A%2F%2Fsearch.brave.com%2F
Just have to make sure the file format is compatible with the program
OBJ is universal though. As far as I know I haven't encountered a 3D program that can't read it.
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