All ChatGPT created, I just was scrivener and Feerless Leader.

data/assumptions.json

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+{
+  "currency": "USD",
+  "waste_factor": 1.15,
+  "electricity_cost_per_kwh": 0.12,
+  "printer_average_watts": 120,
+  "print_hours_per_box": 8.0,
+  "target_box_counts": [1, 4, 12],
+  "printed_materials": [
+    {
+      "id": "petg",
+      "name": "PETG",
+      "cost_per_kg": 22.00,
+      "grams_per_box": 220
+    },
+    {
+      "id": "asa",
+      "name": "ASA",
+      "cost_per_kg": 28.00,
+      "grams_per_box": 90
+    },
+    {
+      "id": "tpu",
+      "name": "TPU",
+      "cost_per_kg": 26.00,
+      "grams_per_box": 20
+    }
+  ],
+  "notes": [
+    "Printed weights are initial estimates and should later be replaced with slicer-derived actuals.",
+    "Waste factor is applied to printed material cost only.",
+    "Electricity uses printer_average_watts multiplied by print_hours_per_box."
+  ]
+}