I stumbled into this video while I was trying to determine if any of the filament welders on offer actually work. If you’ve got lots of spools with only a meter or so of filament, you can use his method to link them together. You can make some multicolored models or just use them for prototypes:
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I stumbled into this video while I was trying to determine if any of the *filament welders on offer actually work. Basically use the soldering iron to make holes along the middle of the 2 surfaces to be joined, and then fold the extruding plastic back into itself to restore … My method is holding both ends into a fire, then pressing them together, melting them, and using a file to get it all nice and smooth.