if you are looking for a way to convert some bitmap graphics file (like .pix) to a 3D model for 3D printing (.stl file), you would have to use a program capable of generating 3D meshes from pictures (typically PNG or JPEG though). You can find plenty of tutorials all over internet for this procedure, even some informative "how to" YouTube videos do nicely explain how to convert pictures for 3D printing.
Updated: June 22, 2022