Cooling/Warming Plate - USB Powered

thingiverse

This is an incredibly versatile heat exchange module in one. When activated on cool mode, it swiftly generates a chilling surface for several minutes. Likewise, when switched to heat mode, the module has ample power to liquefy butter and retain items at a comfortable temperature, utilizing solely USB power as its energy source. The base consists of a solid aluminum cylindrical unit that contains a thin copper plate enclosing a thermoelectric heating system held securely in place by high-performance thermal epoxy. Various other metals can be substituted to optimize the performance.