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From the Model Mayhem FAQ:

Print: What is the refund/return policy?
You may request a refund or reprint for orders that are damaged or printed incorrectly. Refunds must be submitted within 72 hours of receiving shipment. We are not responsible for poor image quality due to low resolution of uploaded images. If there was a problem with the reproduction of your prints please refer to the FAQ “My order is damaged. How do I get a replacement?”