Here's an at (@) shaped cookie cutter I made for a project. I'm a novice, so it may not be perfect, but I didn't have any problems with the printing! I couldn't find a template, so I made my own. I hope it can help you too.
No support needed, 20% infill. Printed with PLA at 200°C with a bed temperature of 60°C
If the model doesn't display correctly in Cura, set the scale to 70000%.
Cookie_cutter_.stl | 185.8KB |