How about getting them to ‘sign’ their models with their copyrighted user-name made with a piece of 3d-text ?
e.g. “©Jim”
At least they’ll have to do that part ??
And you could also ask them to color specific parts of their assignment in colors specified by you - per user ?
Or even with materials named after the user - e.g. Jim_Red, Jim_Green etc…
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