Hi there,
Thanks for reaching out.
If the model is under Royalty-Free license, you can use it as long as it is incorporated into the product and as long as the 3rd party cannot retrieve it on its own in both digital and physical form.
You cannot resell the model you bought in its digital form and you cannot resell it in its printed form.
If you wish to sell the printed model you should ask the designer to add a custom license and provide you with separate rights in writing. We at CGTrader cannot give you the rights to distribute the printed model version.
Thus we always suggest buyers discuss the usage with the seller and gain their approval, this would make you a hundred percent sure that you can proceed with your decision of using the purchase.
Kindly,
Greta from CGTrader