This keyring was designed because I really liked my older, larger Fidget Gear Keyring, but found that it was a bit too big to use as a day-to-day keyring. This keyring features a similar design, but only uses two gears, and both are the smaller, 15T 15PCD gears.Assemble the keychain using two 12mm m3 bolts and two m3 nuts. For ease of turning, I also used a sharp 5mm drill to re-bore the gears at high speed to give a smooth surface inside the bore, and also used a scalpel to clean up the axle shafts from where printing the circular layers left small ridges.