"Design is 800% the size of the original skin file. This ensures all papercraft is to the same standard scale, although we are happy to make exceptions for special cases."
I think this qualifies as a special case. It's 3000% the size of the original sun and moon textures because one's a star and the other's almost a planet.
1. Click on the papercraft design image.
2. Make sure it has not been resized by your browser (you might need to click the image again).
3. Print using your browser's Print function.