Decided to try making apple cider donuts this year. I needed a donut cutter, so I found one online and printed it out. Worked perfect, but the design was flawed. Not a strong connection between the cutting edge and the "handle" and it separated as I was washing it. I'll have to design a better one, just need to add a curved reinforcement around the inside and outside of each cutting edge. Trivial and too bad it wasn't included in the model I found already.
Donuts came out pretty well for a first attempt. I followed the America's Test Kitchen recipe which uses apple juice concentrate instead of boiling down cider. Fried them in the Dutch oven.