Normally you can only fit triangular links into a triangle or hexagon shape. Each of these links have been distorted so the pattern will fit nicely into a circle.

Five sizes have been included based on the number of links from the center to the outer edge. Size 3 is good for a typical coaster and Size 1 is useful to quickly check if your printer settings are right.

All the STL files have links that are about 15mm across. The blue pictures show a Size 3 pattern printed at 100% and the black is a Size 5 printed at 60%.