{
 "description": "Acceptance project (#27): a sensor enclosure for a 60 x 40 mm board. A case (rounded, shelled, a USB cut-out on the front wall, 4 PCB standoffs and 4 lid bosses patterned from one each, a snap fit) and a lid (a lip made from offsets of the case's inner rim, 4 screw holes patterned from one). Everything is sized from the user parameters: board_w, board_d, gap (board to inner wall), wall, height, standoff_h, hole_inset, usb_offset, lid_h.",
 "commands": [
  {
   "command": "parameters.change",
   "params": {
    "name": "board_w",
    "expression": "60 mm",
    "comment": "PCB length"
   }
  },
  {
   "command": "parameters.change",
   "params": {
    "name": "board_d",
    "expression": "40 mm",
    "comment": "PCB width"
   }
  },
  {
   "command": "parameters.change",
   "params": {
    "name": "gap",
    "expression": "8 mm",
    "comment": "PCB to inner wall"
   }
  },
  {
   "command": "parameters.change",
   "params": {
    "name": "wall",
    "expression": "2 mm"
   }
  },
  {
   "command": "parameters.change",
   "params": {
    "name": "height",
    "expression": "25 mm"
   }
  },
  {
   "command": "parameters.change",
   "params": {
    "name": "standoff_h",
    "expression": "5 mm"
   }
  },
  {
   "command": "parameters.change",
   "params": {
    "name": "hole_inset",
    "expression": "3.5 mm",
    "comment": "PCB mounting hole from its edge"
   }
  },
  {
   "command": "parameters.change",
   "params": {
    "name": "usb_offset",
    "expression": "10 mm",
    "comment": "USB connector centre, left of the middle"
   }
  },
  {
   "command": "parameters.change",
   "params": {
    "name": "lid_h",
    "expression": "4 mm"
   }
  },
  {
   "command": "sketch.create",
   "params": {
    "plane": "XY",
    "name": "Outline"
   }
  },
  {
   "command": "sketch.rectangle.center",
   "params": {
    "center": [
     0,
     0
    ],
    "corner": [
     40,
     30
    ]
   }
  },
  {
   "command": "sketch.constraint.coincident",
   "params": {
    "a": "p5",
    "b": "origin"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "l1"
    ],
    "value": "board_w + 2 * (gap + wall)"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "l2"
    ],
    "value": "board_d + 2 * (gap + wall)"
   }
  },
  {
   "command": "sketch.finish",
   "params": {}
  },
  {
   "command": "solid.extrude",
   "params": {
    "distance": "height",
    "body_name": "Case"
   }
  },
  {
   "command": "solid.fillet",
   "params": {
    "edges": [
     [
      40,
      30,
      12.5
     ],
     [
      -40,
      30,
      12.5
     ],
     [
      -40,
      -30,
      12.5
     ],
     [
      40,
      -30,
      12.5
     ]
    ],
    "radius": 4
   }
  },
  {
   "command": "solid.shell",
   "params": {
    "faces": [
     [
      0,
      0,
      25
     ]
    ],
    "thickness": "wall"
   }
  },
  {
   "command": "sketch.create",
   "params": {
    "plane": "XY",
    "name": "PCB standoff",
    "offset": "wall"
   }
  },
  {
   "command": "sketch.circle.center",
   "params": {
    "center": [
     -26.5,
     -16.5
    ],
    "diameter": 6,
    "id": "so"
   }
  },
  {
   "command": "sketch.circle.center",
   "params": {
    "center": "so.center",
    "diameter": 2.5,
    "id": "so_hole"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "origin",
     "so.center"
    ],
    "type": "horizontal",
    "value": "board_w / 2 - hole_inset"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "origin",
     "so.center"
    ],
    "type": "vertical",
    "value": "board_d / 2 - hole_inset"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "so"
    ],
    "type": "diameter",
    "value": "6 mm"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "so_hole"
    ],
    "type": "diameter",
    "value": "2.5 mm"
   }
  },
  {
   "command": "sketch.finish",
   "params": {}
  },
  {
   "command": "solid.extrude",
   "params": {
    "profiles": [
     [
      "so"
     ]
    ],
    "distance": "standoff_h",
    "operation": "join",
    "name": "Standoff"
   }
  },
  {
   "command": "solid.pattern.rectangular",
   "params": {
    "features": [
     "Standoff"
    ],
    "dir1": [
     1,
     0,
     0
    ],
    "count1": 2,
    "spacing1": "board_w - 2 * hole_inset",
    "dir2": [
     0,
     1,
     0
    ],
    "count2": 2,
    "spacing2": "board_d - 2 * hole_inset"
   }
  },
  {
   "command": "sketch.create",
   "params": {
    "plane": {
     "origin": [
      0,
      0,
      0
     ],
     "x_dir": [
      1,
      0,
      0
     ],
     "y_dir": [
      0,
      0,
      1
     ]
    },
    "name": "USB",
    "offset": "board_d / 2 + gap + wall"
   }
  },
  {
   "command": "sketch.rectangle.center",
   "params": {
    "center": [
     -10,
     12
    ],
    "corner": [
     -5.5,
     13.75
    ]
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "l1"
    ],
    "value": "9 mm"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "l2"
    ],
    "value": "3.5 mm"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "origin",
     "p5"
    ],
    "type": "horizontal",
    "value": "usb_offset"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "origin",
     "p5"
    ],
    "type": "vertical",
    "value": "wall + standoff_h + 1.6 mm + 1.75 mm"
   }
  },
  {
   "command": "sketch.finish",
   "params": {}
  },
  {
   "command": "solid.extrude",
   "params": {
    "profiles": [
     [
      "l1",
      "l2",
      "l3",
      "l4"
     ]
    ],
    "distance": "-(wall + 1 mm)",
    "operation": "cut",
    "name": "USB cut"
   }
  },
  {
   "command": "sketch.create",
   "params": {
    "plane": "XY",
    "name": "Lid boss",
    "offset": "wall"
   }
  },
  {
   "command": "sketch.circle.center",
   "params": {
    "center": [
     -34.5,
     -24.5
    ],
    "diameter": 7,
    "id": "bs"
   }
  },
  {
   "command": "sketch.circle.center",
   "params": {
    "center": "bs.center",
    "diameter": 2.5,
    "id": "bs_hole"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "origin",
     "bs.center"
    ],
    "type": "horizontal",
    "value": "board_w / 2 + gap - 4.5 mm"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "origin",
     "bs.center"
    ],
    "type": "vertical",
    "value": "board_d / 2 + gap - 4.5 mm"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "bs"
    ],
    "type": "diameter",
    "value": "7 mm"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "bs_hole"
    ],
    "type": "diameter",
    "value": "2.5 mm"
   }
  },
  {
   "command": "sketch.finish",
   "params": {}
  },
  {
   "command": "solid.extrude",
   "params": {
    "profiles": [
     [
      "bs"
     ]
    ],
    "distance": "height - wall",
    "operation": "join",
    "name": "Lid boss"
   }
  },
  {
   "command": "solid.pattern.rectangular",
   "params": {
    "features": [
     "Lid boss"
    ],
    "dir1": [
     1,
     0,
     0
    ],
    "count1": 2,
    "spacing1": "board_w + 2 * gap - 9 mm",
    "dir2": [
     0,
     1,
     0
    ],
    "count2": 2,
    "spacing2": "board_d + 2 * gap - 9 mm"
   }
  },
  {
   "command": "sketch.create",
   "params": {
    "plane": "XY",
    "offset": "height",
    "name": "Lid outline"
   }
  },
  {
   "command": "sketch.rectangle.center",
   "params": {
    "center": [
     0,
     0
    ],
    "corner": [
     40,
     30
    ]
   }
  },
  {
   "command": "sketch.constraint.coincident",
   "params": {
    "a": "p5",
    "b": "origin"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "l1"
    ],
    "value": "board_w + 2 * (gap + wall)"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "l2"
    ],
    "value": "board_d + 2 * (gap + wall)"
   }
  },
  {
   "command": "sketch.finish",
   "params": {}
  },
  {
   "command": "solid.extrude",
   "params": {
    "distance": "lid_h",
    "operation": "new",
    "body_name": "Lid",
    "name": "Lid"
   }
  },
  {
   "command": "solid.fillet",
   "params": {
    "edges": [
     [
      40,
      30,
      27
     ],
     [
      -40,
      30,
      27
     ],
     [
      -40,
      -30,
      27
     ],
     [
      40,
      -30,
      27
     ]
    ],
    "radius": 4,
    "body": "Lid"
   }
  },
  {
   "command": "plastic.snap_fit",
   "params": {
    "position": [
     0,
     -28,
     20
    ],
    "hook": [
     0,
     0,
     1
    ],
    "length": 8,
    "thickness": 1.2,
    "width": 6,
    "catch_depth": 0.8,
    "catch_length": 1.5,
    "body": "Case"
   }
  },
  {
   "command": "sketch.create",
   "params": {
    "plane": {
     "origin": [
      0,
      0,
      0
     ],
     "x_dir": [
      1,
      0,
      0
     ],
     "y_dir": [
      0,
      -1,
      0
     ]
    },
    "name": "Lid lip",
    "offset": "-height"
   }
  },
  {
   "command": "sketch.project",
   "params": {
    "refs": [
     {
      "face": [
       0,
       0,
       25
      ],
      "body": "Lid"
     }
    ]
   }
  },
  {
   "command": "sketch.project",
   "params": {
    "refs": [
     {
      "face": [
       0,
       29,
       25
      ],
      "body": "Case"
     }
    ]
   }
  },
  {
   "command": "sketch.offset",
   "params": {
    "curves": [
     "l9"
    ],
    "distance": 0.2,
    "side": [
     0,
     0
    ]
   }
  },
  {
   "command": "sketch.offset",
   "params": {
    "curves": [
     "l9"
    ],
    "distance": 1.4,
    "side": [
     0,
     0
    ]
   }
  },
  {
   "command": "sketch.finish",
   "params": {}
  },
  {
   "command": "solid.extrude",
   "params": {
    "sketch": "Lid lip",
    "profiles": [
     [
      "l13",
      "a13",
      "l14",
      "a14",
      "l15",
      "a15",
      "l16",
      "a16"
     ]
    ],
    "distance": "2 mm",
    "operation": "join",
    "targets": [
     "Lid"
    ],
    "name": "Lid lip"
   }
  },
  {
   "command": "sketch.create",
   "params": {
    "plane": "XY",
    "name": "Lid screw",
    "offset": "height + lid_h"
   }
  },
  {
   "command": "sketch.circle.center",
   "params": {
    "center": [
     -33.5,
     -23.5
    ],
    "diameter": 3.2,
    "id": "ls"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "origin",
     "ls.center"
    ],
    "type": "horizontal",
    "value": "board_w / 2 + gap - 4.5 mm"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "origin",
     "ls.center"
    ],
    "type": "vertical",
    "value": "board_d / 2 + gap - 4.5 mm"
   }
  },
  {
   "command": "sketch.dimension",
   "params": {
    "entities": [
     "ls"
    ],
    "type": "diameter",
    "value": "3.2 mm"
   }
  },
  {
   "command": "sketch.finish",
   "params": {}
  },
  {
   "command": "solid.extrude",
   "params": {
    "profiles": [
     [
      "ls"
     ]
    ],
    "through_all": true,
    "direction": "negative",
    "operation": "cut",
    "targets": [
     "Lid"
    ],
    "name": "Lid screw"
   }
  },
  {
   "command": "solid.pattern.rectangular",
   "params": {
    "features": [
     "Lid screw"
    ],
    "dir1": [
     1,
     0,
     0
    ],
    "count1": 2,
    "spacing1": "board_w + 2 * gap - 9 mm",
    "dir2": [
     0,
     1,
     0
    ],
    "count2": 2,
    "spacing2": "board_d + 2 * gap - 9 mm"
   }
  }
 ]
}