Ember Travel Mug Coaster (Round)
thingiverse
Didn't want to shell out cash for an Ember Coaster so I chose to print my own coaster and hook it up to a standard 19v power supply. Ordered some pogo pins, but for now makeshift tips soldered onto the ends of some wires will suffice. Do this at your own peril. I have no idea if simply plugging a 19V Laptop Power Supply into the coaster without any additional components will harm your mug.
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