Mark,
The items you received, which are manufactured by Cross Electric Designs, are 3D printed via a process called Fused Deposition Modeling (or FDM for short) as noted in the product description. This takes a plastic filament, melts it at over 210c, and builds via layers. This type of material has been used for well over a decade if not more for 3D printing of terrain items, which is widely known for warping when left in the sun. Please reach out to us via the Contact Form on our site so we can put you in touch with Cross Electric Designs if you want and they can discuss with you further and maybe even replace the item.
