$fn=256;

// all measurements in mm
height = 100; // total
hoseClampWidth = 12; // accomodate 5/16" (8mm) hose clamp width
sectionHeight = 22; // (height - 2 * hoseClampWidth) / 3;
centerHeight = height - 2 * (hoseClampWidth + sectionHeight);

/*
difference() {
  union() {
    // main sections
    for (i = [-1,1]) {
      translate([0, 0, i * (hoseClampWidth + sectionHeight)])
      cylinder(d = 48, h = sectionHeight, center = true);
    }

    // hose pipe fitting sections
    for (i = [-1,1]) {
      translate([0, 0, i * (0.1 + hoseClampWidth + sectionHeight) * 0.5])
      cylinder(d = 44, h = hoseClampWidth + 0.2, center = true);

      translate([0, 0, i * ((sectionHeight + hoseClampWidth) * 0.5) + (hoseClampWidth * 0.5) - 1])
      cylinder(d1 = 44, d2 = 48, h = 2, center = true);

      translate([0, 0, i * ((sectionHeight + hoseClampWidth) * 0.5) + (hoseClampWidth * 0.5) + 1 - hoseClampWidth])
      cylinder(d1 = 48, d2 = 44, h = 2, center = true);
    }

    // center section
    cylinder(d = 48, h = sectionHeight, center = true);

    // center ring
    translate([0, 0, -1.5]) cylinder(d1 = 48, d2 = 52, h = 3, center = true);
    translate([0, 0, 1.5]) cylinder(d1 = 52, d2 = 48, h = 3, center = true);
  }

  // hollow out
  cylinder(d = 36, h = 100.2, center = true);
}
*/

difference() {
  union() {
    // main sections
    for (i = [-1,1]) {
      translate([0, 0, i * ((centerHeight + sectionHeight) * 0.5 + hoseClampWidth)])
      cylinder(d = 48, h = sectionHeight, center = true);
    }

    // hose pipe fitting sections
    for (i = [-1,1]) {
      translate([0, 0, i * (0.1 + hoseClampWidth + centerHeight) * 0.5])
      cylinder(d = 44, h = hoseClampWidth + 0.2, center = true);

      color("SlateGray")
      translate([0, 0, (hoseClampWidth / 2 - 1) + i * ((centerHeight + hoseClampWidth)* 0.5)])
      cylinder(d1 = 44, d2 = 48, h = 2, center = true);

      color("SeaGreen")
      translate([0, 0, -(hoseClampWidth / 2 - 1) + i * ((centerHeight + hoseClampWidth)* 0.5)])
      cylinder(d1 = 48, d2 = 44, h = 2, center = true);
    }

    // center section
    cylinder(d = 48, h = centerHeight, center = true);

    // center ring
    translate([0, 0, -1.5]) cylinder(d1 = 48, d2 = 52, h = 3, center = true);
    translate([0, 0, 1.5]) cylinder(d1 = 52, d2 = 48, h = 3, center = true);
  }

  // hollow out
  cylinder(d = 36, h = 100.2, center = true);
}