Ball and socket fish designed to print all in one piece. It worked great. I used the meshmixed version that was meshmixed with ultimaker 2 support settings. The ball joints are loose so that they are free floating inside the socket, but they will not come out. It wiggles very easily and thus is truly very floppy. Ultimaker 2 Cura: (Used the Meshmixed File) .2 mm 20 percent infil .8 thick walls raft no supports