Polycarbonate Tiko Build Plate

While Tiko build plate works well, I like having multiple build plates and don't like printing with rafts.

These rings help keep the Tiko from shifting when placed on a glass or polycarbonate sheet, and act as a template for cutting the sheet. Just glue the ring on a sheet of polycarbonate, then trim the edges with a [3d printed router table](http://www.thingiverse.com/thing:1940095).

I used 1/8" polycarbonate (these were left over from my RigidBot), but thinner sheets would be cheaper an