I was really courious, how these flexi things can be printed, so when I found the Flexi Rex, I knew, I have to print it. It looks cool. I used an Ender 3 S1 Pro with Sonic Pad, with the basic setting what came with the Creality Print slicer. The best, that this model was very easy to print, did't need to change anythihing. The material was the Ender-PLA value pack. Funny thing, that I tried many brands' PLA+, but this simple PLA is much better and easier to print with. Only the white colour is not sooo clear white, but I do not really care. I also printed a smaller version and drilled a hole on it, so I have a Flexi Rex keychain :)