Is it illegal to use copyrighted images to create custom phone cases (for personal use ) ?

Anonymous
SO I have been looking for a specific case for some time and It happens they don't make that design for my Phone , so I thought I'd create my own case through one of those Custom Case creating websites. But I know that using copyrighted images (the one I'm using is from a Anime show) is illegal. But Since I am printing it for my own use (I'm only printing 1 case ) would this still be illegal?
Is it illegal to use copyrighted images to create custom phone cases (for personal use ) ?
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