Beer Butler Robot, Refrigerator on a Roomba

This is the main chiller unit, Igloo says it can chill 40 cans or 4 liters of liquid up to 40 degree below ambient temperature. The bottom larger sink is the hot side and top is the cool side. there is a large solid aluminum block that serves as a thermal pipe to move the heat from the cool side to the hot side . since the block is very thick i can insulate the area where the beverages will be. The Peltier unit is sandwiched on the hot side. Both already have fans that are blower style. Fans usually work much better when pulling than pushing into a heatsink. That being said I believe I will use some larger 120mm High performance PC fans to make sure the air flows nicely. Also PC fans are made with low sound options which is a pet peave of mine when building any project.

Anyone have ideas of hot to make this chilling unit better? suggestions ? thanks

I picked up this can from Walmart as well as a smaller one in diameter that will serve as the internal insulated chamber.

This is a challenge issued by friends and family. The goal here is to make a robot that can bring beverages from another area to wherever the people are , allow the person to get their drink , then leave. It does not need to be fully autonomous , even remote control is acceptable. It does not need to grab them from the fridge, pre loaded beverages are acceptable. This is Ez Robot though, I believe we could do better than that! Well anyways to start the project off I am using a roomba base. I picked up a stainless steel trash can last night as a outside casing. I will show you the rest as we go