There seem to be some persistent misconceptions about this stuff.  You don't need to extract any files, and you don't need dev mode.  You just need to specify the full file path:

exportobj models/whatever.bin

By exporting the model to the game's root, all you're doing is saving yourself from having to type the file's path, while also introducing the need for dev mode, because the game doesn't load any unpackaged files without it.

Hi Chilly, this tutorial worked for me just fine. But not gog version, I used the steam version, right that's the difference. You used the regular in game console and not the editor console? And you moved the model (bin) file out of models folder into turok root folder? Worked every time for me. When I made an error there was a note in console that would say .mtl not found or obj not found.