This product is made of photosensitive resin, non-injection molded parts. This product are 3D printed products, some models need to be simple bonding. Will not be “will not be assembled, assembly difficulties” as the reason for the return! All products may exist in the store, manual processing, or sanding removal of support traces and other unavoidable circumstances. Some parts may have molding failure, please contact customer service for free replacement! If it is needed in your country custom. I additionally offer discounts of up to 20%, please contact me. Sometimes take longer in some remote city. We accept return or replace goods within 30 days after package signed. We will reply you ASAP. Our aim is to provide Top Level Customer Service, so we will try our best to solve any problem. Working time: Monday-SaturdayBeijing Time 8:30A. We will reply to you within 24 hours. As soon as possible.