focusrite-scarlett-mounting-bracket

// A mounting bracket for the Focusrite Scarlett Solo audio interface
// This is a bracket that holds an audio device underneath a desk or shelf. The audio device has dimensions of 144mm wide, 80mm length and 45mm depth with fillets of 6mm. This mounting bracket is designed to be 3D printed with PLA material

// define constants in mm
radius = 6.0
width = 144.0
length = 80.0
depth = 45.0
thk = 4
holeDiam = 5
tabLength = 25
tabWidth = 12
tabThk = 4

// define a rectangular shape func
fn rectShape = (pos, w, l) => {
  rr = startSketchOn('xy')
    |> startProfileAt([pos[0] - (w / 2), pos[1] - (l / 2)], %)
    |> lineTo([pos[0] + w / 2, pos[1] - (l / 2)], %, $edge01)
    |> lineTo([pos[0] + w / 2, pos[1] + l / 2], %, $edge02)
    |> lineTo([pos[0] - (w / 2), pos[1] + l / 2], %, $edge03)
    |> close(%, $edge04)
  return rr
}

// define the bracket plane
bracketPlane = {
  plane: {
    origin: { x: 0, y: length / 2 + thk, z: 0 },
    xAxis: { x: 1, y: 0, z: 0 },
    yAxis: { x: 0, y: 0, z: 1 },
    zAxis: { x: 0, y: -1, z: 0 }
  }
}

// build the bracket sketch around the body
fn bracketSketch = (w, d, t) => {
  s = startSketchOn(bracketPlane)
    |> startProfileAt([-w / 2 - t, d + t], %)
    |> lineTo([-w / 2 - t, -t], %, $edge1)
    |> lineTo([w / 2 + t, -t], %, $edge2)
    |> lineTo([w / 2 + t, d + t], %, $edge3)
    |> lineTo([w / 2, d + t], %, $edge4)
    |> lineTo([w / 2, 0], %, $edge5)
    |> lineTo([-w / 2, 0], %, $edge6)
    |> lineTo([-w / 2, d + t], %, $edge7)
    |> close(%, $edge8)
  return s
}

// build the body of the bracket
bs = bracketSketch(width, depth, thk)
bracketBody = bs
  |> extrude(length + 2 * thk, %)
  |> fillet({
       radius: radius,
       tags: [
         getPreviousAdjacentEdge(bs.tags.edge7),
         getPreviousAdjacentEdge(bs.tags.edge2),
         getPreviousAdjacentEdge(bs.tags.edge3),
         getPreviousAdjacentEdge(bs.tags.edge6)
       ]
     }, %)

// define the tab plane
tabPlane = {
  plane: {
    origin: { x: 0, y: 0, z: depth + thk },
    xAxis: { x: 1, y: 0, z: 0 },
    yAxis: { x: 0, y: 1, z: 0 },
    zAxis: { x: 0, y: 0, z: 1 }
  }
}

// build the tabs of the mounting bracket (right side)
tabsR = startSketchOn(tabPlane)
  |> startProfileAt([width / 2 + thk, length / 2 + thk], %)
  |> line([tabWidth, -tabLength / 3], %, $edge11)
  |> line([0, -tabLength / 3 * 2], %, $edge12)
  |> line([-tabWidth, -tabLength / 3], %, $edge13)
  |> close(%, $edge14)
  |> hole(circle({
       center: [
         width / 2 + thk + tabWidth / 2,
         length / 2 + thk - (tabLength / (3 / 2))
       ],
       radius: holeDiam / 2
     }, %), %)
  |> extrude(-tabThk, %)
  |> fillet({
       radius: holeDiam / 2,
       tags: [
         getNextAdjacentEdge(edge11),
         getNextAdjacentEdge(edge12)
       ]
     }, %)
  |> patternLinear3d({
       axis: [0, -1, 0],
       instances: 2,
       distance: length + 2 * thk - (tabLength * 4 / 3)
     }, %)

// build the tabs of the mounting bracket (left side)
tabsL = startSketchOn(tabPlane)
  |> startProfileAt([-width / 2 - thk, length / 2 + thk], %)
  |> line([-tabWidth, -tabLength / 3], %, $edge21)
  |> line([0, -tabLength / 3 * 2], %, $edge22)
  |> line([tabWidth, -tabLength / 3], %, $edge23)
  |> close(%, $edge24)
  |> hole(circle({
       center: [
         -width / 2 - thk - (tabWidth / 2),
         length / 2 + thk - (tabLength / (3 / 2))
       ], radius: holeDiam / 2
     }, %), %)
  |> extrude(-tabThk, %)
  |> fillet({
       radius: holeDiam / 2,
       tags: [
         getNextAdjacentEdge(edge21),
         getNextAdjacentEdge(edge22)
       ]
     }, %)
  |> patternLinear3d({
       axis: [0, -1, 0],
       instances: 2,
       distance: length + 2 * thk - (tabLength * 4 / 3)
     }, %)

// define a plane for retention bumps
retPlane = {
  plane: {
    origin: { x: -width / 2 + 20, y: 0, z: 0 },
    xAxis: { x: 0, y: 1, z: 0 },
    yAxis: { x: 0, y: 0, z: 1 },
    zAxis: { x: 1, y: 0, z: 0 }
  }
}

// build the retention bump in the front
retFront = startSketchOn(retPlane)
  |> startProfileAt([-length / 2 - thk, 0], %)
  |> line([0, thk], %)
  |> line([thk, -thk], %)
  |> close(%)
  |> extrude(width - 40, %)

// build the retention bump in the back
retBack = startSketchOn(retPlane)
  |> startProfileAt([length / 2 + thk, 0], %)
  |> line([0, thk], %)
  |> line([-thk, 0], %)
  |> line([0, -thk], %)
  |> close(%)
  |> extrude(width - 40, %)