Plastic welder from soldering iron.
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Previously:
https://www.homemadetools.net/forum/...520#post193110
https://www.homemadetools.net/forum/...679#post193678
https://www.homemadetools.net/forum/...447#post181817
https://www.homemadetools.net/forum/...591#post162773
https://www.homemadetools.net/forum/...112#post176342