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You could maybe add mylar to the cone's inner surface to combat the radiation heat transfer. It would also reflect light forward!
Steampunk Solar Powered Air Conditioner and Identity Card Holder
Make a Ring From a Nut
Simple 10w Bluetooth Portable Speaker
3D Printed Sound Sculpture
Concrete lamp base with 3D printed shade
Book Light Reading Light
Low-Cost Linear Actuator Based on the Sarrus Linkage
Night Shower- A DIY LED Earring
Charcoal Powered Generator - Gasifier
"Little Dipper" SLA/DLP 3D printer for under $500 (projector included)
Ultrabright LED Emergency Lamp (Rechargeable!)
Portable Hot Tub
Home Theater screen, 3 different ways (High quality + Low $$)
Wall Art 3D
Simple 2-way motor control for the arduino
Watermelon jello shot slices
iThrone: Build an Iron Throne for your phone for less than $25
Arduino Etch-A-Sketch Clock
How to Make a Three Axis CNC Machine (Cheaply and Easily)
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