time = 0;

SPROCKET_BASE_D = 19.05; //8 frames
SPROCKET_BASE_H = 2.7;

INNER_D = 13.98;
INNER_H = 10.6;

TOP_BASE_D = 18.47;
TOP_BASE_H = 2.96;

LIP_D = 18.84;
LIP_H = 0.33;

HOLLOW_D = 4.7;
HOLLOW_BASE_D = 12.01;
HOLLOW_BASE_H = 6.09;

TOP_D = 21.66;
TOP_H = 1.4;

SPROCKET_H = 10;
SPROCKET_W = 0.79;
SPROCKET_L = 1.3;

FRAME_C = (SPROCKET_BASE_D * PI) / 8;
//echo(FRAME_C);

$fn = 100;
module sprocket () {
    //cube([SPROCKET_L, SPROCKET_W, SPROCKET_H], center = true);
    translate ([0, 0, -SPROCKET_H/2]) {
        difference () {
            translate([0, 0, 0]) scale([1, 1, 2.25]) rotate([90, 0, 90]) cylinder(r = SPROCKET_W/2, h = SPROCKET_L, center = true);
            translate([0, 0, -1]) cube([2, 2, 2], center = true);
            //translate([1.5, 0, 0]) rotate([0, -5, 0]) cube([2, 2, 2], center = true);
            //translate([-1.5, 0, 0]) rotate([0, 5, 0]) cube([2, 2, 2], center = true);
        }
    }
}
module sprocketed_roller () {
    difference () {
        union () {
           cylinder(r = SPROCKET_BASE_D / 2, h = SPROCKET_BASE_H, center = true);

            translate([0, 0, (INNER_H / 2) + (SPROCKET_BASE_H / 2)]) cylinder(r = INNER_D / 2, h = INNER_H, center = true);

            translate([0, 0, (TOP_BASE_H / 2) +INNER_H + (SPROCKET_BASE_H / 2)]) cylinder(r = TOP_BASE_D / 2, h = TOP_BASE_H, center = true);
            translate([0, 0, (TOP_BASE_H / 2) + INNER_H + (SPROCKET_BASE_H / 2) - (TOP_BASE_H / 2) + (LIP_H / 2)]) cylinder(r = LIP_D / 2, h = LIP_H, center = true);
            translate([0, 0, (TOP_BASE_H / 2) + INNER_H + (SPROCKET_BASE_H / 2) + (TOP_BASE_H / 2) - (LIP_H / 2)]) cylinder(r = LIP_D / 2, h = LIP_H, center = true);
            translate([0, 0, (TOP_H / 2) + (TOP_BASE_H / 2) + INNER_H + (SPROCKET_BASE_H / 2) + (TOP_BASE_H / 2) - (LIP_H / 2)]) cylinder(r = TOP_D / 2, h = TOP_H, center = true);
        }
        cylinder(r = HOLLOW_D / 2, h = 100, center = true);
        translate([0, 0, (HOLLOW_BASE_H / 2) - (SPROCKET_BASE_H / 2)]) cylinder(r = HOLLOW_BASE_D/2, h = HOLLOW_BASE_H + 0.1, center = true);
    }
    for (i = [0: 8]) {
        rotate([0, 0, i * 360 / 8]) translate([(SPROCKET_BASE_D / 2) + (SPROCKET_H / 2) - .15, 0, (SPROCKET_BASE_H / 2) - (SPROCKET_L / 2)]) rotate([0, 90, 0]) sprocket();
    }
}

sprocketed_roller();