The little Thingummies get together with gyroscopic keyring to create a new keychain !!! In the background you can see a couple of my " gyroscopic keyring 2 ". You can find other Thingummies in my collection " The Thingummies ". This thing is composed by four independent rings, rotating freely. It has a diameter of 4 cm and is 1.7 cm thick . Printed at 25% filling. If you use brim , you need a bit of work to clean the internal ring.have a look at other gyro keychains at: “gyroscopic relaxing keyring – 6 rings”, at http://www.thingiverse.com/thing:1307100 “gyroscopic keyring 11”, at http://www.thingiverse.com/thing:1225044 “gyroscopic keyring with flower 2”, at http://www.thingiverse.com/thing:1149171 “gyroscopic keyring with flower ”, at http://www.thingiverse.com/thing:1091961 “gyroscopic keyring 2”, at http://www.thingiverse.com/thing:644217