This is our cup design sketch:

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I think the hardest thing about making this cup warmer is the fact that we didn’t have the materials we needed, so we had to figure out a way to replace the material using something we had acess to, which was a bit difficult.  If I could go back and do this project again, I would bring my own materials from home, that way we woudn’t have to waste so much time looking for an alternative. I would also not spend so much time on the paper prototype. I think the quality of this mug warmer is excellent. I spent a great deal of time crotcheting the removable and washable cover, and the inner pouch is made of two pieces of leather sewn together. Inside, it has an amazing combination of conductors stuffed in the pouch. This mug insulator is very high quality.