I would add another criteria: the 3D piece which is represented should be realistically 3D-printable and not too fragile.
I would presume that anyone who makes 3D pieces is already keeping that one in mind. Since I don't have a 3D printer to test pieces with myself, I will leave it up to you and Bob to judge whether your pieces fit this criterion.
I would presume that anyone who makes 3D pieces is already keeping that one in mind. Since I don't have a 3D printer to test pieces with myself, I will leave it up to you and Bob to judge whether your pieces fit this criterion.