This is a 20x scale minute gear that is slotted for a movement you might get from a place like Michaels.Also, I've added all of the parts you need to print a 20x Gear O'Clock (about 10" in diameter). These are taken from the original things linked to the left.Print the parts from the thing from which this thing is derived (a couple of levels deep). And use this drive gear instead! Make sure your outer gear parts are printed at 20x scale, too!Note: All STLs are already sized so you can just print them to get a 20x size clock which is about 10" in diameter.Base Quarter (x20).stl Print 4 of these. Clock Mechanism Mount Cutout.stl Print one. Even Numbers Plate (x20).stl Print one. Minute Gear (Slotted, x20).stl Print one. Odd Numbers Plate (x20).stl Print one. Seconds Gear.stl Print one.