18650 -> 2 "D" Cells

Looking through the various prints that use a lithium 18650 cell in place of 2 D Cells, I ran across designs that required print support or parts I didn't have on hand. There was one that used aluminum foil which was intriguing but when I printed, it didn't work in my application so I ended up designing my own. I'd link this as a re-mix but I can no longer find the thing this is based off of.
No printing supports or rafts are required and heavy duty aluminum foil about 4 layers thick works well once folded into a 5/16 inch (8mm) wide and 3.5 (90 mm) long strip. I however use 8mm nickel strips that I have on-hand for spot welding lithium batteries. The nickel strips are better since they are more robust but a thicker strip of thicker aluminum would work similarly if you had a source. I suggest a strip from a frozen dinner but I don't think there are many that use aluminum containers. Maybe a pop can?
Please keep in mind that a single 18650 is about 0.7 volt higher than 2 D cell