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Hold the iron vertically, apply light pressure, allow the plastic to cool, and do not touch heated metal parts\u003c\/li\u003e\n \u003cli\u003eFor 3D-printed assemblies: Add reusable M3 connection points to compatible thermoplastic enclosures, brackets, jigs, fixtures, models and DIY parts. Confirm hole size, depth and material temperature tolerance; test on scrap first\u003c\/li\u003e\n \u003c\/ul\u003e"}