Traditional Java Specctra .dsn autorouters frequently stall in infinite rip-up loops on rotated QFP/QFN footprints, fine-pitch USB-C connectors, and 2-layer/4-layer power corridors—or emit traces that fail KiCad's native copper Design Rule Checker.
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.kicad_pcb, .dsn, or project .zip onto calligraphyeda.com, inspect the 350-DPI Proof Loupe for $0, and download your routed .kicad_pcb + Gerber X2 + JLCPCB BOM/CPL bundle.