Like I said Saturday, it looks like the papercrafts on the Sanrio Characters Pon Pon Jump! are indeed a weekly deal, because it changed from Hello Kitty to My Melody - get it before Sunday before it changes to a new one again...!* 🐱🐰🎀
Download + build your own free official supercute Sanrio My Melody papercraft (by Sanrio Characters Pon Pon Jump!):
(download instructions: click the pink "ペーパークラフトのダウンロードはこちらから >" button at the bottom of the Sanrio Characters Pon Pon Jump! craft page for the PDF parts file; check back every week for a new papercraft!)
* NOTE: I don't know how many different papercrafts there will be in the end, and it's best if you just check back every week to download the new one of course. But for people that already missed the first Hello Kitty one (sorry for telling you guys so late about it 😟) there might be a way to still get it by doing a Site:Search for it (by adding the file name "vol1.pdf" as search term and the "site:" parameter before the domain URL):
The Hello Kitty papercraft PDF still seems to be on the website for now, but I don't know if they will eventually remove it completely, or that you could keep changing the "vol.pdf" number to look up ones you missed...?
Please note that the site has to be "crawled" first (or whatever they call it 😉) for Google to find the link and show it in your search results, so if it doesn't show up the first day, try again later that week)
Long story short: always save papercrafts you like to your computer when you find them, even if you're not planning to build them anytime soon...! 😉