I have a Black & Decker Toaster Oven, same model as this: http://www.blackanddeckerappliances.com/products/cooking-appliances/convection-and-toaster-ovens/counter-top-toaster-oven-tro480bs.aspx
One of the plastic feet cracked on it from all the taking it in and out of the cabinet. This meant it was wobbly. After failing to super-glue it once, I finally learned how to design 3D parts using Fusion 360. This is my final piece. It fit perfectly, but the design is just slightly off from the original. I think it looks pretty good on the oven and you would never even notice it.
Hopefully this will help someone else get motivated to create something practical that can serve a purpose repairing and older appliance.
I printed the foot upside down. This gave the best results for the curvature of the front.
Original Left, designed on the Right