4 Springs, and now other 6 springs attached to the top and bottom disks, Disks height and radius are adjustable as well as the angle of rotation of the four springs, slice account and the form of the each leg, by how many angles there are by param dollarFN 4 is four corners, 5 ,6, hex oct. etc.Play around and modify as you like, Designful item for 3D printing. by <5> /4\ T (0) <5> |-| |