3D Printed Abacus

An abacus. The original thing was great, but I wanted the part in two colors, now if you don't have dual extrusion then that is completely obsolete, but this model should still print fine, it will just require more separation due to more bonding between like materials. Instructions on how to use an abacus are available here http://www.wikihow.com/Use-an-Abacus.