This is a trick used in 3D printing which has huge uses in crafting and armour building. The principle is to take a piece of plastic and using high-friction melt it and the two surfaces together to make a single piece of plastic. This is most easily accomplished with ABS as the welding material is easy to obtain. You can use 3mm ABS filament for 3D printers as your welding material, its the same diameter (1/8") as the receiver for a Dremel rotary tool.
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