1. Get imaged from digital camera, memory card or scanner. 2. Print image with heat transfer paper and sublimation ink 3. Stick the imaged paper on the polymer case surface by heat resistant tape. 4. Add the cover to the metal tool, and then use the 3D vacuum sublimation machine to transfer the image directly. (180 degrees, 180S) 5. Tear off the image paper and cool it for some time. 6. Add the polymer case to your cell phone. 7. Enjoy your personal designed 3D Phone case!