I made a 3D model of Rex a year or two ago. I didn't make it for 3D printing, I made it as a model to use in a fan film that I've been working on, but the program I made it in is a program for making 3D print models and I've used the program for 3D print models before, so it should be able to be printed out. Keep in mind that the models aren't incredibly detailed (I did most of the detailing as textures to save poly count) and it would need to be resized, but I can send the files to you if you'd like.
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Yes I would be interested in the model you have. Thanks for offering it.