A simple bottle with a hollow, watertight interior

// Bottle
// A simple bottle with a hollow, watertight interior
// Categories: Maker

// Set Units
@settings(defaultLengthUnit = mm)

// Input dimensions to define the bottle
bottleWidth = 80
bottleLength = 125
bottleHeight = 220
neckDepth = 18
neckDiameter = 45
wallThickness = 4

halfBottleLength = bottleLength / 2
halfBottleWidth = bottleWidth / 2
shoulderTransitionHeight = bottleWidth / 3
shoulderArcRise = halfBottleWidth - shoulderTransitionHeight
shoulderArcRadius = (halfBottleLength ^ 2 + shoulderArcRise ^ 2) / (2 * shoulderArcRise)
shoulderArcCenterOffset = shoulderArcRadius - halfBottleWidth
neckRadius = neckDiameter / 2

// Create a rounded body for the bottle
bottleFootprint = sketch(on = XY) {
  leftSide = line(start = [var -62.5mm, var -26.67mm], end = [var -62.5mm, var 26.67mm])
  topArc = arc(start = [var 62.5mm, var 26.52mm], end = [var -62.5mm, var 26.81mm], center = [var 0mm, var -112.78mm])
  rightSide = line(start = [var 62.5mm, var 26.52mm], end = [var 62.5mm, var -26.67mm])
  bottomArc = arc(start = [var -62.5mm, var -26.67mm], end = [var 62.5mm, var -26.67mm], center = [var 0mm, var 113.15mm])

  topGuide = line(start = [var -62.5mm, var 26.67mm], end = [var 63.21mm, var 30.34mm], construction = true)
  bottomGuide = line(start = [var -62.5mm, var -26.67mm], end = [var 62.5mm, var -26.67mm], construction = true)
  centerAxis = line(start = [var 2.22mm, var -100.21mm], end = [var 0mm, var 113.15mm], construction = true)

  coincident([leftSide.end, topArc.end])
  coincident([topArc.start, rightSide.start])
  coincident([rightSide.end, bottomArc.end])
  coincident([bottomArc.start, leftSide.start])

  coincident([topGuide.start, topArc.end])
  coincident([topGuide.end, topArc.start])
  coincident([bottomGuide.start, bottomArc.start])
  coincident([bottomGuide.end, bottomArc.end])
  coincident([centerAxis.start, topArc.center])
  coincident([centerAxis.end, bottomArc.center])

  vertical(leftSide)
  vertical(rightSide)
  horizontal(topGuide)
  horizontal(bottomGuide)
  vertical(centerAxis)

  horizontalDistance([topGuide.start, topGuide.end]) == bottleLength
  verticalDistance([leftSide.start, leftSide.end]) == shoulderTransitionHeight * 2
  equalLength([leftSide, rightSide])
  horizontalDistance([topArc.center, ORIGIN]) == 0mm
  horizontalDistance([bottomArc.center, ORIGIN]) == 0mm
  verticalDistance([bottomGuide.start, ORIGIN]) == 26.67mm
  radius(topArc) == 152.64mm
  horizontalDistance([centerAxis.start, ORIGIN]) == 0mm
  radius(bottomArc) == 153.15mm
}

bottleBodyRegion = region(point = [30mm, 0mm], sketch = bottleFootprint)
hide(bottleFootprint)
bottleBody = extrude(bottleBodyRegion, length = bottleHeight - neckDepth)

// Create a neck centered at the top of the bottle
neckProfile = sketch(on = faceOf(bottleBody, face = END)) {
  neckCircle = circle(start = [var 22.5mm, var 0mm], center = [var 0mm, var 0mm])
  neckRadiusGuide = line(start = [var 0mm, var 0mm], end = [var 22.5mm, var 0mm], construction = true)

  coincident([neckCircle.center, ORIGIN])
  coincident([
    neckRadiusGuide.start,
    neckCircle.center
  ])
  coincident([neckRadiusGuide.end, neckCircle.start])
  horizontal(neckRadiusGuide)

  diameter(neckCircle) == neckDiameter
  distance([neckCircle.center, neckCircle.start]) == neckRadius
}

neckRegion = region(segments = [neckProfile.neckCircle])
hide(neckProfile)
bottleWithNeck = extrude(
  neckRegion,
  length = neckDepth,
  method = MERGE,
  tagEnd = $neckTop,
)

// Define a shell operation so that the entire body and neck are hollow, with only the top face opened
bottleShellSolid = shell(bottleWithNeck, faces = [neckTop], thickness = wallThickness)
bottleShell = appearance(bottleShellSolid, color = "#0078c2")


Bottle

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