A snowflake cutter. Designed for making snowflake soaps, it's also fine for cookies. I also made a thing for pushing the soap/dough out of the cutter if it gets stuck inside. It saves a lot of time over poking it out with a q-tip or something.

If you print with .35 extrusion width, the walls will be 2 perimeters wide. I don't recommend using Slic3r 09x, it didnt' make a steady, unbroken toolpath for the walls. The print shown was done with KISSlicer.

I recommend printing in ABS and smoothing with acetone. That will bond the layers together on the walls for extra strength, especially the edge. The two threads of the edge might be prone to splitting apart otherwise. I used the Presto Part Finisher from Walmart - http://solidoodletips.wordpress.com/2012/11/10/presto-part-finisher/

Here is a video of it in action making Snowflake soaps for a school fundraiser.

http://youtu.be/9nd59afVuRY