We have a really awesome free model today by renderking.it. It’s a spark plug and it’s 100% free to use! Enjoy! P.S. I textured and lit it with Octane Render, just so you know, but it’s only a few materials which would be easy to replace if you use a different render engine.
To download this model all you have to do is sign up for our e-mail newsletter. We have 250+ free models available to people on our list. After signing up you’ll get a follow up e-mail with the download instructions. If you are already a subscriber just check for any previous e-mails from me. They all include the download URL/password. Enjoy!