{
  "opd": "benikigai/plus-one",
  "commit": 6,
  "opd_version": "0.5.0",
  "layer": "parts",
  "question": "What is it made of, and how much does each part vary?",
  "data": {
    "parts": [
      {
        "id": "part:top-shell",
        "name": "Top shell",
        "material": {
          "value": "PC/ABS, graphite, soft-touch texture",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "injection-moulded, 1-cavity tool",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 3.83,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "from CAD volume at 1.15 g/cm3"
        },
        "geometry": {
          "step": "parts/top-shell.step",
          "usd_prim": "/Product/TopShell",
          "fidelity": "reduced"
        }
      },
      {
        "id": "part:ring-diffuser",
        "name": "Light-ring diffuser",
        "material": {
          "value": "PC, light-diffusing grade, lime tint",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "injection-moulded, heat-staked into the top shell",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 0.69,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "from CAD volume at 1.20 g/cm3"
        },
        "geometry": {
          "step": "parts/ring-diffuser.step",
          "usd_prim": "/Product/RingDiffuser",
          "fidelity": "reduced"
        }
      },
      {
        "id": "part:plus-button",
        "name": "Plus button",
        "material": {
          "value": "PC/ABS cap, pad-printed white plus",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "injection-moulded, pad-printed",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 1.52,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "from CAD volume at 1.15 g/cm3"
        },
        "geometry": {
          "step": "parts/plus-button.step",
          "usd_prim": "/Product/PlusButton",
          "fidelity": "reduced"
        }
      },
      {
        "id": "part:mic-gasket",
        "name": "Mic gasket",
        "material": {
          "value": "silicone foam, acoustic grade",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "die-cut, adhesive-backed",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 0.01,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/mic-gasket.step",
          "usd_prim": "/Product/MicGasket_1",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:main-pcba",
        "name": "Main board (PCBA)",
        "material": {
          "value": "FR-4, 4 layers, 0.8 mm, ENIG, round 52 mm",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought assembled from the EMS, tested before shipping",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 6,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/main-pcba.step",
          "usd_prim": "/Product/MainPCBA",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:speaker",
        "name": "Speaker, 12 mm thin",
        "material": {
          "value": "micro speaker, 12 mm, 3 mm tall, 8 ohm, 0.5 W",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought assembled",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 1.2,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/speaker.step",
          "usd_prim": "/Product/Speaker",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:haptic-motor",
        "name": "Haptic motor, 7 mm coin",
        "material": {
          "value": "coin LRA, 7 mm, 2.5 mm tall",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought assembled, adhesive-backed",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 0.6,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/haptic-motor.step",
          "usd_prim": "/Product/HapticMotor",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:battery",
        "name": "Li-ion cell with protection",
        "material": {
          "value": "lithium-ion polymer, 28 x 16 x 3.5 mm, with protection board and lead; sits beside the module under the board",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought assembled with a connector on the lead",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 3.5,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/battery.step",
          "usd_prim": "/Product/Battery",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:battery-foam",
        "name": "Battery foam tape",
        "material": {
          "value": "PU foam, 0.1 mm, double-sided acrylic",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "die-cut",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 0.1,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/battery-foam.step",
          "usd_prim": "/Product/BatteryFoam",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:base",
        "name": "Base: the interface",
        "material": {
          "value": "PC/ABS, graphite",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "injection-moulded with three twist-lock lugs inside the rim, an alignment key and pad seats; snaps to the top shell",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 3.51,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "from CAD volume at 1.15 g/cm3"
        },
        "geometry": {
          "step": "parts/base.step",
          "usd_prim": "/Product/Base",
          "fidelity": "reduced"
        }
      },
      {
        "id": "part:magnet-ring",
        "name": "Magnet ring",
        "material": {
          "value": "NdFeB arc segments in a ring sized for magnetic phone mounts and chargers; exact size and polarity still to be checked against the WPC spec",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought as a ring assembly; bonded into the base pocket",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 4.46,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "from CAD volume at 7.5 g/cm3"
        },
        "geometry": {
          "step": "parts/magnet-ring.step",
          "usd_prim": "/Product/MagnetRing",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:qi-coil",
        "name": "Wireless charging coil and ferrite",
        "material": {
          "value": "copper coil, 37 mm, on a ferrite sheet; sits inside the magnet ring",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought; meets the board through two spring contacts",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 2,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/qi-coil.step",
          "usd_prim": "/Product/QiCoil",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:pogo-pad",
        "name": "Pogo pad",
        "material": {
          "value": "brass, gold-plated, 2.4 mm",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "insert-moulded into the base",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 0.01,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/pogo-pad.step",
          "usd_prim": "/Product/PogoPad_1",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:board-screw",
        "name": "Board screw, 2 mm thread-forming for plastics",
        "material": {
          "value": "steel, black zinc",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 0.1,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "from CAD volume at 7.85 g/cm3"
        },
        "geometry": {
          "step": "parts/board-screw.step",
          "usd_prim": "/Product/BoardScrew_1",
          "fidelity": "reduced"
        }
      },
      {
        "id": "part:esp32-s3-module",
        "name": "ESP32-S3 module, 16 MB flash, 8 MB PSRAM",
        "material": {
          "value": "ESP32-S3-WROOM-1 class module with PCB antenna, shielded",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief",
            "src:module-datasheet"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/esp32-s3-module.step",
          "usd_prim": "/Product/PCBA_ESP32S3Module",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:mems-mic",
        "name": "MEMS microphone, bottom port",
        "material": {
          "value": "digital PDM MEMS mic",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/mems-mic.step",
          "usd_prim": "/Product/PCBA_MEMSMic_1",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:audio-amp",
        "name": "Class-D amp with a capped output",
        "material": {
          "value": "mono I2S class-D amp; gain and current limited in hardware",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/audio-amp.step",
          "usd_prim": "/Product/PCBA_AudioAmp",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:haptic-driver",
        "name": "Haptic driver",
        "material": {
          "value": "LRA driver IC",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/haptic-driver.step",
          "usd_prim": "/Product/PCBA_HapticDriver",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:imu",
        "name": "6-axis motion sensor",
        "material": {
          "value": "MEMS accelerometer and gyroscope",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/imu.step",
          "usd_prim": "/Product/PCBA_IMU",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:fuel-gauge",
        "name": "Fuel gauge",
        "material": {
          "value": "single-cell fuel gauge IC",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/fuel-gauge.step",
          "usd_prim": "/Product/PCBA_FuelGauge",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:charger",
        "name": "Charger with power path",
        "material": {
          "value": "single-cell Li-ion charger IC",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/charger.step",
          "usd_prim": "/Product/PCBA_Charger",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:wireless-receiver",
        "name": "Wireless charging receiver",
        "material": {
          "value": "receiver IC; charges the cell, never transmits",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/wireless-receiver.step",
          "usd_prim": "/Product/PCBA_WirelessReceiver",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:ring-led",
        "name": "RGB LED, addressable",
        "material": {
          "value": "2 x 2 mm addressable RGB LED",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/ring-led.step",
          "usd_prim": "/Product/PCBA_RingLED_1",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:tact-switch",
        "name": "Tactile switch under the plus",
        "material": {
          "value": "6 x 6 mm tactile switch",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/tact-switch.step",
          "usd_prim": "/Product/PCBA_TactSwitch",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:usb-c",
        "name": "USB-C receptacle, mid-mount",
        "material": {
          "value": "16-pin USB-C receptacle",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/usb-c.step",
          "usd_prim": "/Product/PCBA_USBC",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:boot-button",
        "name": "BOOT button",
        "material": {
          "value": "side-push tactile switch",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/boot-button.step",
          "usd_prim": "/Product/PCBA_BootButton",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:power-switch",
        "name": "Hardware power-off switch",
        "material": {
          "value": "slide switch in series with the cell",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/power-switch.step",
          "usd_prim": "/Product/PCBA_PowerSwitch",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:qwiic-connector",
        "name": "Qwiic connector",
        "material": {
          "value": "4-pin 1.0 mm JST SH",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/qwiic-connector.step",
          "usd_prim": "/Product/PCBA_Qwiic",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:battery-connector",
        "name": "Battery connector",
        "material": {
          "value": "2-pin 1.25 mm wire-to-board",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/battery-connector.step",
          "usd_prim": "/Product/PCBA_BatteryConnector",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:pcb",
        "name": "Bare board, 4 layers",
        "material": {
          "value": "FR-4, Tg 150, round 53 mm",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/pcb.step",
          "usd_prim": "/Product/PCBA_PCB",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:passives",
        "name": "Passives",
        "material": {
          "value": "MLCC, resistors, ferrites; count not fixed yet",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "purchased-component, placed by the EMS",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/passives.step",
          "usd_prim": "/Product/PCBA_Passives",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:light-sensor",
        "name": "Ambient light sensor (Plus One+)",
        "material": {
          "value": "digital ambient light sensor",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "Plus One+ only; footprint empty on Core"
        },
        "process": {
          "value": "purchased-component",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/light-sensor.step",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:nfc-tag",
        "name": "NFC tag (Plus One+)",
        "material": {
          "value": "NFC Forum type 2 tag IC with PCB antenna",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "Plus One+ only; footprint empty on Core"
        },
        "process": {
          "value": "purchased-component",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/nfc-tag.step",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:debug-jumper",
        "name": "Power test jumper and debug pads (Plus One+)",
        "material": {
          "value": "0 ohm jumper and test pads",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "Plus One+ only; footprint empty on Core"
        },
        "process": {
          "value": "purchased-component",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "geometry": {
          "step": "parts/debug-jumper.step",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:retail-box",
        "name": "Retail box",
        "material": {
          "value": "SBS board, printed",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 30,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/retail-box.step",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:pulp-tray",
        "name": "Pulp tray",
        "material": {
          "value": "moulded pulp",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 8,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/pulp-tray.step",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:usb-cable",
        "name": "USB-C cable, 0.5 m",
        "material": {
          "value": "TPE jacket, copper",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 15,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/usb-cable.step",
          "fidelity": "envelope"
        }
      },
      {
        "id": "part:quick-card",
        "name": "Quick start card with the unit QR",
        "material": {
          "value": "coated card, printed",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "process": {
          "value": "bought",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design choice"
        },
        "mass_g": {
          "value": 3,
          "unit": "g",
          "source": "inferred",
          "confidence": "low",
          "evidence": [
            "src:design-brief"
          ],
          "note": "design target"
        },
        "geometry": {
          "step": "parts/quick-card.step",
          "fidelity": "envelope"
        }
      }
    ],
    "assemblies": [
      {
        "id": "asm:top-sub",
        "name": "Top shell with diffuser, plus button and mic gaskets"
      },
      {
        "id": "asm:core",
        "name": "Top shell sub-assembly with board, speaker, haptic and battery"
      },
      {
        "id": "asm:base",
        "name": "Base with the magnet ring, charging coil and pads"
      },
      {
        "id": "asm:plus-one",
        "name": "Plus One, sealed, nothing attached"
      },
      {
        "id": "asm:packed",
        "name": "Packed unit with cable and card; no back ships"
      }
    ]
  }
}