diff --git a/tools/adaptive-isogrid/src/nx/import_profile.py b/tools/adaptive-isogrid/src/nx/import_profile.py
index 9e8abc4a..cc0df6ba 100644
--- a/tools/adaptive-isogrid/src/nx/import_profile.py
+++ b/tools/adaptive-isogrid/src/nx/import_profile.py
@@ -254,16 +254,15 @@ def _draw_polylines_batch(
     close: bool = True,
 ) -> int:
     """
-    Draw multiple closed polylines in the sketch efficiently.
+    Draw multiple closed polylines directly in the active sketch using
+    SketchLineBuilder (creates native sketch geometry, not model curves).
 
-    Creates all lines as NX curves first (fast), then adds them
-    to the sketch in one batch call (much faster than per-line builders).
+    The sketch must be Activate'd before calling this.
 
-    Returns total number of lines created.
+    Returns total number of line segments created.
     """
     import NXOpen
 
-    all_lines = []
     total_lines = 0
 
     for points_3d in polylines_3d:
@@ -284,58 +283,21 @@ def _draw_polylines_batch(
             p2 = points_3d[(i + 1) % n]
 
             try:
-                # CurveCollection.CreateLine(start: Point, end: Point) -> Line
-                start_obj = part.Points.CreatePoint(
-                    NXOpen.Point3d(p1[0], p1[1], p1[2])
-                )
-                end_obj = part.Points.CreatePoint(
-                    NXOpen.Point3d(p2[0], p2[1], p2[2])
-                )
-                line = part.Curves.CreateLine(start_obj, end_obj)
-                all_lines.append(line)
+                lb = part.Sketches.CreateLineBuilder()
+                lb.SetStartPoint(NXOpen.Point3d(p1[0], p1[1], p1[2]))
+                lb.SetEndPoint(NXOpen.Point3d(p2[0], p2[1], p2[2]))
+                lb.Commit()
+                lb.Destroy()
                 total_lines += 1
             except Exception as exc:
                 if total_lines == 0:
-                    lister.WriteLine(f"[import] CreateLine failed: {exc}")
-                    # Try SketchLineBuilder as fallback for first line
-                    try:
-                        lb = part.Sketches.CreateLineBuilder()
-                        lb.SetStartPoint(NXOpen.Point3d(p1[0], p1[1], p1[2]))
-                        lb.SetEndPoint(NXOpen.Point3d(p2[0], p2[1], p2[2]))
-                        lb.Commit()
-                        lb.Destroy()
-                        total_lines += 1
-                        lister.WriteLine("[import] SketchLineBuilder fallback worked")
-                    except Exception as exc2:
-                        lister.WriteLine(f"[import] Both methods failed: {exc2}")
-                        return 0
+                    lister.WriteLine(f"[import] SketchLineBuilder failed on first line: {exc}")
+                    return 0
 
-    # Add all curves to sketch in one batch call
-    if all_lines:
-        try:
-            # Sketch.AddGeometry(infer, ellipse, curves)
-            # Enums are nested under NXOpen.Sketch, not NXOpen directly
-            infer = NXOpen.Sketch.InferConstraintsOption.InferNoConstraints
-            ellipse = NXOpen.Sketch.AddEllipseOption.TreatAsEllipse
-            sketch.AddGeometry(infer, ellipse, all_lines)
-            lister.WriteLine(f"[import] Added {len(all_lines)} lines to sketch via AddGeometry")
-        except Exception as exc:
-            lister.WriteLine(f"[import] AddGeometry batch failed: {exc}")
-            # Try adding one by one
-            added = 0
-            try:
-                infer = NXOpen.Sketch.InferConstraintsOption.InferNoConstraints
-                ellipse = NXOpen.Sketch.AddEllipseOption.TreatAsEllipse
-            except Exception:
-                infer = None
-            if infer is not None:
-                for line in all_lines:
-                    try:
-                        sketch.AddGeometry(infer, ellipse, [line])
-                        added += 1
-                    except Exception:
-                        pass
-            lister.WriteLine(f"[import] Added {added}/{len(all_lines)} lines individually")
+        # Progress every 50 polylines
+        if (total_lines > 0) and (len(polylines_3d) > 50) and \
+           (polylines_3d.index(points_3d) % 50 == 49):
+            lister.WriteLine(f"[import]   ... {total_lines} lines so far")
 
     return total_lines