{
  "geometry_status": "pass",
  "sample_count": 41,
  "swept_stroke_mm": [
    0,
    20
  ],
  "states": [
    {
      "s_mm": 0,
      "tip_x_mm": -29,
      "piston_x_mm": [
        0,
        22
      ],
      "spring_seat_spacing_mm": 28,
      "spring_solid_margin_mm": 22,
      "boss_tip_gap_mm": 24,
      "button_stop_gap_mm": 20,
      "chamber_volume_before_spring_mm3": 9101.570908568061
    },
    {
      "s_mm": 17,
      "tip_x_mm": -12,
      "piston_x_mm": [
        17,
        39
      ],
      "spring_seat_spacing_mm": 11,
      "spring_solid_margin_mm": 5,
      "boss_tip_gap_mm": 7,
      "button_stop_gap_mm": 3,
      "chamber_volume_before_spring_mm3": 3545.098814016866
    },
    {
      "s_mm": 20,
      "tip_x_mm": -9,
      "piston_x_mm": [
        20,
        42
      ],
      "spring_seat_spacing_mm": 8,
      "spring_solid_margin_mm": 2,
      "boss_tip_gap_mm": 4,
      "button_stop_gap_mm": 0,
      "chamber_volume_before_spring_mm3": 2564.54491497842
    }
  ],
  "moving_part_collisions": [],
  "fixed_part_collisions": [],
  "intentional_press_fits": [
    {
      "parts": [
        "rear_cap",
        "reed_pin"
      ],
      "volume_mm3": 0.2884077926589657,
      "diametral_interference_mm": 0.04999999999999982
    }
  ],
  "exact_cad_state_checks": [
    {
      "s_mm": 0,
      "intersection_mm3": {
        "housing": 0.0,
        "front_cap": 0.0,
        "rear_cap": 0.0
      }
    },
    {
      "s_mm": 17,
      "intersection_mm3": {
        "housing": 0.0,
        "front_cap": 0.0,
        "rear_cap": 0.0
      }
    },
    {
      "s_mm": 20,
      "intersection_mm3": {
        "housing": 0.0,
        "front_cap": 0.0,
        "rear_cap": 0.0
      }
    }
  ],
  "radial_piston_clearance_cad_mm": 0.34999999999999787,
  "target_finished_radial_gap_mm": 0.03999999999999915,
  "radial_rod_guide_clearance_mm": 0.1499999999999999,
  "working_reserve_mm": 3,
  "piston_stays_in_bore": true,
  "spring_boss_diametral_clearance_mm": 3.3600000000000003,
  "reed_spring_envelope_intersection_mm3": 0.0,
  "reed_seal_to_spring_radial_gap_mm": 1.0,
  "flat_tape_contact_area_mm2": 3512.2743338823075,
  "expected_contact_area_mm2": 3512.274333882308,
  "minimum_base_under_rear_relief_mm": 1.8,
  "spring_initial_compression_mm": 4,
  "spring_nominal_wire_turn_solid_length_mm": 1.92,
  "fillets": {
    "requested_mm": 2,
    "gusset_to_base_edges": 2,
    "note": ""
  },
  "changes_from_original_brief": [
    "22 mm seal-free piston; 50 mm cylinder; spring seats 28/11/8 mm",
    "Piston O-ring groove and rear O-ring removed; no separate bleed outlet",
    "Rear joint uses a shallow tape annulus; adhesion and sealing require a bench test",
    "Four printed through-pins and C clips replace the four M3 cap screws",
    "PLA reed and printed blind push pin replace silicone flap and M2 screw",
    "Reed anchor moved to Y0, Z+7 for a longer flexing neck within the bore",
    "Top-only base relief behind the cylinder resolves the rear-cap/base clash"
  ],
  "unresolved": [
    "Actual finished bore/piston roundness, taper, friction and leakage",
    "PLA reed closure, reopening and fatigue; no silicone valve is used",
    "Printed pin and clip retention, including actual printer clearance",
    "Tape annulus compressed thickness, airtightness and cap adhesion",
    "Piano-wire spring rate, measured solid length and reset force",
    "Hinge driving force, door trajectory and tape shear/peel loads"
  ],
  "performance_simulated": false,
  "fit_trial": {
    "revision": "Fixed V1: measured-fit trial 1",
    "release": "2026-10-15 measured-fit trial",
    "generator_sha256": "e09d5aa352d28a193a8904c7831864e46d767da1e576812f78b3b9c131011f67",
    "baseline_params_sha256": "b5a4be2318883415214d52a0760181de8d319674ca31215b8001a46c10f4a2ac",
    "front_cap_sha256": "e8335553f41f8a65841f90987c93bcbe1b1838ba27cbd1bf0eda139c2cca6f8b",
    "changes": {
      "bore_diameter_compensation": 0.4,
      "piston_diameter_compensation": -0.22
    },
    "measurements_mm": {
      "housing_inside_diameter": 19.67,
      "plunger_outside_diameter": 20.0,
      "rod_outside_diameter": 5.65
    },
    "measurement_basis": "User caliper measurements of current test pieces; approximate and assumed to correspond to the 20.00/19.92/6.00 mm CAD release. Printer settings, ovality and taper not recorded.",
    "predicted_repeat_print_mm": {
      "housing_inside_diameter": 20.07,
      "plunger_outside_diameter": 19.78,
      "diametral_clearance": 0.29
    },
    "physical_status": "Unprinted fit trial. Prediction assumes unchanged per-surface print errors, not uniform scaling. Damping and leakage have not been evaluated. Rod, front cap and all other print parts are unchanged."
  }
}