This sculpture, entitled Ogre Ears, is crafted from 111 identical 3D printed forms that are assembled into an interlocking hexagonal grid. From: http://herschelshapiro.com/ogre-ears/

Assembling a 111 piece sculpture as shown in the picture requires about 600pcs of Stainless Steel Flat Head Self Tapping Screws. The screw size is M2x8, M2.5x8 or M3x8 depending on the fit which changes with different print settings.