// --- 1" PIPE RING TEST ARRAY ---
$fn = 80;
p1 = 33.4; // 1" Pipe OD
wall = 3.0;
h = 10;    // Height of ring

offsets = [0.05, 0.10, 0.15, 0.20, 0.25, 0.30];

for (i = [0 : 5]) {
    translate([i * 45, 0, 0]) {
        difference() {
            // Outer Ring
            cylinder(d = p1 + offsets[i] + (wall*2), h = h);
            // Inner Hole
            translate([0,0,-1]) cylinder(d = p1 + offsets[i], h = h+2);
            
            // Identification Notches (Number of notches = position in array)
            for (n = [0 : i]) {
                rotate([0, 0, n * 15]) 
                translate([(p1 + wall*2)/2, 0, h/2]) 
                cube([4, 1, h+1], center=true);
            }
        }
    }
}