Open-Source PCB Routing Torture Benchmark (55 / 55 Boards at 100.0% Completion & 0 Native KiCad DRC)

Every hardware engineer who has tried traditional maze autorouters (Freerouting, legacy push-and-shove scripts, or pure LLM coordinate generators) knows the trap:

• A router that reaches 94% net completion with 45 DRC clearance violations has not solved your board — it has boxed in the hardest 6% of nets (0.40 mm–0.50 mm fine-pitch QFP/QFN/BGA pins, off-axis rotated connectors, and split return planes) so badly that ripping up and fixing the remaining airwires by hand takes longer than routing from scratch.
• Our Benchmark Standard (Strict 100.0% + 0 DRC): A PCB routing engine only passes a board when native kicad-cli pcb drc --severity-all (after fresh copper zone refill via pcbnew.ZONE_FILLER) reports:
  • 0 Unconnected Items (100.0% geometric net completion)
  • 0 Copper DRC Violations (clearances, track widths, annular rings, hole-to-hole, and rule-area keepouts)
  • <= 0.00007 mm Footprint & Specctra Round-Trip Coordinate Drift

Have an unrouted KiCad (.kicad_pcb), Altium (.PcbDoc), Eagle (.brd), or Specctra (.dsn) board that stalled Freerouting?

1. Drop It into the Browser ($0 Upfront): https://calligraphyeda.com (or click one of the 1-Tap Live Demo Boards at the top of the page — even on mobile).
2. Inspect the 350-DPI Copper Proof & 3D WebGL View: Zoom into every fine-pitch pad entry, differential pair, and ground return transition before paying a cent.
3. Open-Hardware & First-Board Grants:
   • OPENHW ($0.00 Free Unlock): Working on an open-source hardware board with a public GitHub repo? Enter code OPENHW with your repo URL to unlock the full routed .kicad_pcb + Gerbers + IPC-D-356 + 3D HTML5 bundle for $0.00 (5/day).
   • PROTOTYPE1 ($1.00 First-Board Prototype Pass): Unlock your first private 2-layer breakout board (<= 150 pads) for $1.00 USDC on Base (5/day).
   • 1-Line Claude Code / Cursor MCP Co-Processor:

     claude mcp add --transport http calligraphy-eda https://calligraphyeda.com/api/v1/mcp

The 20 open-source boards below comprise the community PCBench benchmark and Frontier challenge suite (including the 10 Frontier boards t11–t20 where standard open-source routers leave unrouted nets, create clearance violations, or stall on multi-pass congestion):

t05_DAC-ADAU1966 (4-Layer Studio Audio DAC — 2,663 segs, 125 vias)	t15_jadonk_PocketBone (4-Layer BeagleBone Linux SBC — 1,257 segs, 118 vias)

t20_ti_cc3200_quadcopter (4-Layer RF Quadcopter Flight Controller — 1,252 segs, 104 vias)	Karabas-Nano (2-Layer 738-Pad / 928-Connection Retro Z80 Torture Board)

Decelerator-4030 350-DPI Copper Proof	Decelerator-4030 Raytraced 3D View

Teensy MCU Breakout 350-DPI Copper Proof	Teensy MCU Breakout Raytraced 3D View

Never trust a screenshot without running kicad-cli pcb drc --severity-all yourself. Use verify_drc_zero.py on any routed .kicad_pcb file to refill all copper zones on a temporary copy and verify unconnected_count == 0 and copper_drc_error_count == 0:

python3 verify_drc_zero.py path/to/routed_board.kicad_pcb

• vibe-hardware-mcp — Model Context Protocol (MCP) server & CLI for wiring Claude Code, Cursor, and Windsurf to autonomous 0-DRC PCB synthesis.
• calligraphy-kicad-plugin — Official 1-click KiCad Action Plugin (PCM) for pre-flight routing quotes and $0 350-DPI Copper Proof inspection.
• Foundry Portal: https://calligraphyeda.com