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The CAD modeling equivalent of dividing by zero! When you use SolidWorks' autodimension on threaded parts, the software tries to measure every single thread spiral and suddenly your simple bolt becomes a computational nightmare. Your workstation fans kick into jet engine mode, the program freezes for 20 minutes, and then crashes spectacularly—taking your unsaved work with it. It's basically asking your computer to calculate π to the last digit. Engineers who've made this mistake develop a thousand-yard stare that haunts them through their careers.