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Sculpted Leather Mask Tutorial
PVC softens at 92 Celsius. You could just put the cut rings into boiling water to bring them to temp with zero risk of burning the plastic. The water might even capture some of the chemicals off-gassing from the plastic as it is heated. Double win?
Joule Thief Low Voltage Battery Charger
Sealed cables on cheap (winterize your bicycle)
Tent Small Rocket Stove KP
The Collegiate Foam Sack
Sweet Dorm Furniture