diff --git a/stl/c1.scad b/stl/c1.scad
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+// --- PROJECT: MODULAR PVC PAINT BOOTH ---
+// --- C1: SNAP-ON SHEETING CLIP (PARAMETRIC) ---
+
+/* [User Fit Settings] */
+// Link this to your successful notch test offset
+fit_offset = 0.45; 
+pvc_od = 33.4; 
+
+/* [Clip Dimensions] */
+clip_height = 30;      // Length of the clip along the pipe
+clip_wall = 3.0;       // Thickness of the springy plastic
+grip_angle = 240;      // How far the clip wraps around (360 = full circle)
+
+/* [Advanced] */
+$fn = 80;
+id = pvc_od + fit_offset;
+od = id + (clip_wall * 2);
+
+module sheeting_clip() {
+    difference() {
+        // Main outer body
+        cylinder(d = od, h = clip_height);
+        
+        // Inner cavity for pipe
+        translate([0, 0, -1])
+            cylinder(d = id, h = clip_height + 2);
+            
+        // The "Opening" (Pie slice cut out)
+        // This allows the clip to snap over the pipe
+        rotate([0, 0, grip_angle/2])
+            rotate_extrude(angle = 360 - grip_angle)
+            square([od, clip_height + 2]);
+
+        // Flared edges for easier snapping
+        // Small cylinders at the tips to prevent tearing plastic
+        for(side = [-1, 1]) {
+            rotate([0, 0, (grip_angle/2) * side])
+            translate([id/2, 0, -1])
+            cylinder(d = 2, h = clip_height + 2, $fn=20);
+        }
+    }
+}
+
+sheeting_clip();
\ No newline at end of file
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