diff --git a/src/py/mat3ra/made/tools/build/utils.py b/src/py/mat3ra/made/tools/build/utils.py
index c57c9df6..6c2639d4 100644
--- a/src/py/mat3ra/made/tools/build/utils.py
+++ b/src/py/mat3ra/made/tools/build/utils.py
@@ -174,5 +174,7 @@ def stack_two_materials_xy(
     phase_2_material = expand_lattice_vectors(phase_2_material, gap)
 
     phase_2_material = translate_by_vector(phase_2_material, [gap / 2, 0, 0], use_cartesian_coordinates=True)
-    interface = merge_materials([phase_1_material, phase_2_material], distance_tolerance=distance_tolerance)
+    interface = merge_materials(
+        [phase_1_material, phase_2_material], distance_tolerance=distance_tolerance, merge_dangerously=True
+    )
     return interface