Decorative edge cutters - made for polymer clay

These 3D printed edge cutters are 4" long and taper to a sharp cutting edge. Left and right sides of each cutter is mirrored for making earring pairs

Pressing straight down will allow you to join together two pieces neatly as shown in the heart pieces in these pics.  

Clay may get stuck in some of the smaller designs so use a release like corn starch or water, or try with a thinner thickness of clay