Summary

This is a cooling/warming plate in one. When set on cool it provides a cold surface for a few minutes, and when set to heat it has enough power to melt butter and keep things warm using only USB power.

The bottom is a solid aluminum cylinder w/ a thin copper plate sandwiching a thermoelectric heat pump secured with thermal epoxy. Other metals can be substituted and will alter performance.

Parts List
1) Aluminum Cylinder
2) Copper Plate
2) Thermoelectric heat pump
3) Rocker Switch
4) USB Cord
5) Thermal Epoxy
6) Silicone Caulk
7) 3d Printed Body

It's a silly for funsies project, as far as practical use it's a good warming plate.