This one is the SD Mazinger Z papercraft from a popular site that has also brought us some amazing Gundam paper models in the past. No intros for this one anymore since I've posted a Mazinger Z papercraft (regular size) before. The site is in Japanese so just check the photo below on how to download the goods. You have the option of downloading the pattern individually (no color) or download the complete PDF file (colored), the instructions are in the bottom of their page.
SD Mazinger Z Papercraft [shirokumatawagoto]