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calibration/test rings v2.scad

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+// --- NEW CALIBRATION TRIO (TIGHTER RANGE) ---
+$fn = 100;
+
+pvc_od = 33.4; 
+wall = 4;
+height = 10; // 10mm tall for speed
+
+// New tighter offsets
+offsets = [0.05, 0.15, 0.25]; 
+
+module test_ring(offset, index) {
+    id = pvc_od + offset;
+    od = id + (wall * 2);
+    
+    translate([index * (od + 10), 0, 0]) {
+        difference() {
+            cylinder(d = od, h = height);
+            
+            // Clean hole through
+            translate([0, 0, -1])
+                cylinder(d = id, h = height + 2);
+            
+            // Identification Notches
+            for (n = [0 : index]) {
+                rotate([0, 0, n * 20])
+                translate([od/2, 0, height/2])
+                cube([4, 2, height + 1], center=true);
+            }
+        }
+    }
+}
+
+test_ring(offsets[0], 0); // 1 Notch  (0.05)
+test_ring(offsets[1], 1); // 2 Notches (0.15)
+test_ring(offsets[2], 2); // 3 Notches (0.25)