The thicker the shell, the stronger your object will be. However, complicated designs don't need thick shells. For cookie cutters, the default . 8 mm should work just fine.
If it's one-time-use, both ABS and PLA are perfectly safe for use as a cookie cutter. The "food safety" of 3D printed parts is fairly controversial. In fact, whether any particular material is approved by regulators (such as the US FDA) for food contact is much more complex than most people realize.
I've recently found printing my cutters on draft/standard results in a good cookie cutter quickly. I've been printing 3-4in. cutters on draft at about 20-38 minutes. High quality I've seen go as long as almost 2 hours for a large cutter.
Cookie cutters are a great way to bake, whether you use them to make cookies of your favorite animal or character, or just to get that perfect star shape every time! Opening up a whole new world of cookie cutters is 3D printing, because the sky's the limit in terms of what shapes you can design, customize, and print.. . . . .364011235598!]0000000000000009783314146990!]
