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The "Notch" System: * 1 Notch = The smallest offset (tightest).

3 Notches = Your current "winners" (0.15 for 1" and 0.20 for 1/2").

6 Notches = The largest offset (loosest).

Documentation Entry: "Tolerance tests should be performed whenever switching filament brands or PVC manufacturers. Use the 10mm ring array; the '3-notch' ring represents the gold-standard fit for the current Centauri Carbon calibration."

1%22 pipe ring test.scad

@@ -0,0 +1,25 @@
+// --- 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);
+            }
+        }
+    }
+}