book_spec.json

{
  "type": "book",
  "name": "Grimoire_of_Echoes",
  "size_m": { "x": 0.20, "y": 0.26, "z": 0.04 },
  "bevel_m": 0.002,
  "corner_caps": true,
  "strap": { "enabled": true, "width_m": 0.025 },
  "style": { "leather": "dark_brown", "metal": "brass", "wear": 0.3 }
}