Ice King Crown with Peltier Cooler and Bone Conduction

thingiverse

This Ice King crown is designed to house electronics which allow you to keep cool and beam voices straight into your head, video here: https://youtu.be/4TwiBUQmq4Y Remixed from 3DCentralVA; that original crown, while awesome, is a bit asymmetrical and polygonal. But overall loved the look, so stole half the silhouette and based this crown off of that. I'm afraid I won't be providing any in-depth tutorials, but seasoned makers ought to be able to recreate from the video and info here. Printed on a Taz 6, Polymaker PolyLite PLA "True Yellow", 0.38mm layer height. Jewels were spray painted Gloss Apple Red cause I didn't have any red filament. Loops in the back are for elastic band, took mine off a cheap Halloween mask. Batteries are nano-tech 300mAh 1S 35C, had them lying around. Used two of them, one connected via slide switch to the Peltier Cooler and PC fan in parallel. The other is boosted to 5V for the bluetooth player. The booster I used is a bit funny in this set-up, it's "smart" so only supplies power when it senses a device is plugged in. This means I sometimes have to "jump start" the bluetooth player by plugging it into the booster via USB cable. Once the booster senses the player it will continue providing power via the soldered connections after the USB cable is unplugged. Try not to go over 70% max volume from your phone as this may actually be out of spec for the booster and transducers and you may get cut-outs/distortion/magic smoke. The Peltier cooler is from ebay like 10 years ago, any 12V Peltier cooler that's 40x40mm will probably do (I think there may even be 5V ones these days, but be careful since running my 12V Peltier cooler off 3.7V makes it just cool enough to feel like brain-freeze on the outside, any colder and you may get frostbite!) Make sure your switch is rated for a few amps, that peltier cooler is an energy hog! The heatsink plate is 1.5" wide 1/16" thick aluminum cute to size. The forehead interface plate is the aluminum plate from an old project enclosure, so unless you've got the same one I do you'll likely have to cute your own plate to size to match the nut slots of the crown. Mounted with #8 screws, nuts slide into the nut slots. The forehead interface plate holds the entire Peltier assembly together via compression, but avoid overtightening, as this will make the forehead interface plate bow and reduce cooling efficiency. Basically all the PCBs/batteries/jewels are mounted with hot glue and double sided foam tape. You'll probably want to think of better mounting strategies, I was in a hurry to make a deadline. The crown is extremely power hungry, the cooling battery will last maybe 5-10 min continuously, the other maybe 20min continously playing sounds. Links to stuff I have links for: Battery Booster/Charger: https://amzn.to/2Phvmk3 Mini PC Fan: https://amzn.to/2C3HuSf Heatsinks: https://amzn.to/2pDweV3 Bluetooth Player Module: https://amzn.to/2NutJOl Bone Conduction Transducer: https://www.adafruit.com/product/1674