Designed to fit the SAB Kraken 580/700 and the RAW 580/700. I used these on my Kraken 700 KSE and Kraken 580 and a friend used them on his Piuma. I recommend to use velcro along the tray and then hook/loop tape around the battery packs. Both can be bought cheaply from eBay or Amazon and the trays are FAR cheaper than SAB OEM. I used to print these on my Ender 5 Plus, but 1 tray does fit on the Bambu and prints in just over an hour.