// Cord toggle for securing grommet equipment

mainDiam=10;
mainLength=20;
cordDiam=3;
cordHoleGap=1;
flattenBottom=0.3;
$fn = 40;

difference(){

// cyl mirrored across yz +++++++++++++++++++++++++++++++++++++++++++
color("blue"){
  for (dir = [-1 : 1] ) mirror([dir, 0, 0]){
    union(){
      rotate([0,90,0]){
          cylinder(mainLength / 2, d = mainDiam, center=false);
      }
      // rounded ends
      translate([mainLength / 2, 0, 0]){
        sphere(d = mainDiam);
      }
    }
  }
}

// flatten bottom for better print and interface ---------------------------
color("red"){
  translate([0, 0, -1 * (1 - flattenBottom) * mainDiam]){
    cube( [2 * mainLength, mainDiam, mainDiam], center=true);
  }
}

//holes for cord
color("green"){
    for (dir = [-1 : 1]) mirror([dir, 0, 0]){
        translate([cordHoleGap * cordDiam, 0, 0]){
          cylinder( mainDiam * 1.1, d = cordDiam, center = true);

        }
    }
}

//relief for cord bend
color("yellow"){
    translate([0, 0, mainDiam / 2]){
        rotate([0, 90, 0]){
            cylinder(cordDiam * cordHoleGap * 2, d = cordDiam, center = true);
          }
      }
  }
}