diff --git a/src/core/base_mold_generator.py b/src/core/base_mold_generator.py
index 3609764..83928e3 100644
--- a/src/core/base_mold_generator.py
+++ b/src/core/base_mold_generator.py
@@ -313,10 +313,12 @@ class BaseMoldGenerator:
         base_p2 = list(mold_max)
 
         for i in range(3):
+            prod_span = prod_max[i] - prod_min[i]
+            overlap = max(prod_span * 0.03, 0.5)
             if parting_normal[i] > 0:
-                base_p2[i] = prod_min[i]
+                base_p2[i] = prod_min[i] + overlap
             elif parting_normal[i] < 0:
-                base_p1[i] = prod_max[i]
+                base_p1[i] = prod_max[i] - overlap
 
         base_plate = None
         try: