diff --git a/Resources/panels/FlangeParameters.ui b/Resources/panels/FlangeParameters.ui
index 1c400ed..a2f20af 100644
--- a/Resources/panels/FlangeParameters.ui
+++ b/Resources/panels/FlangeParameters.ui
@@ -1408,6 +1408,26 @@ min-width: 28px;</string>
                    </iconset>
                   </property>
                  </item>
+                 <item>
+                  <property name="text">
+                   <string>Material Inside (90° legacy)</string>
+                  </property>
+                  <property name="icon">
+                   <iconset>
+                    <normalon>Icons:SheetMetal_WallPosMatIns.svg</normalon>
+                   </iconset>
+                  </property>
+                 </item>
+                 <item>
+                  <property name="text">
+                   <string>Thickness Outside (legacy)</string>
+                  </property>
+                  <property name="icon">
+                   <iconset>
+                    <normalon>Icons:SheetMetal_WallPosThkOut.svg</normalon>
+                   </iconset>
+                  </property>
+                 </item>
                 </widget>
                </item>
               </layout>
diff --git a/SheetMetalCmd.py b/SheetMetalCmd.py
index dc56c0d..d158efe 100644
--- a/SheetMetalCmd.py
+++ b/SheetMetalCmd.py
@@ -1263,12 +1263,18 @@ def smBend(
     if BendType == "Material Outside":
         offset = 0.0
         inside = False
-    elif BendType == "Material Inside":
+    elif BendType == "Material Inside": # legacy mode for backwards compatibility
         offset = -(thk + bendR)
         inside = True
-    elif BendType == "Thickness Outside":
+    elif BendType == "Thickness Outside": # legacy mode for backwards compatibility
         offset = -bendR
         inside = True
+    elif BendType == "Material Inside V2":
+        offset = -(thk + bendR) * abs(math.tan(math.radians(bendA * 0.5)))
+        inside = True
+    elif BendType == "Thickness Outside V2":
+        offset = -bendR * abs(math.tan(math.radians(bendA * 0.5)))
+        inside = True
     elif BendType == "Offset":
         if offset < 0.0:
             inside = True
@@ -1278,14 +1284,14 @@ def smBend(
     if LengthSpec == "Leg":
         pass
     elif LengthSpec == "Tangential":
-        if bendA >= 90.0:
+        if bendA >= 90.0 or bendA <= -90.0:
             extLen -= thk + bendR
         else:
-            extLen -= (bendR + thk) / math.tan(math.radians(90.0 - bendA / 2))
+            extLen -= (bendR + thk) / abs(math.tan(math.radians(90.0 - bendA / 2)))
     elif LengthSpec == "Inner Sharp":
-        extLen -= (bendR) / math.tan(math.radians(90.0 - bendA / 2))
+        extLen -= (bendR) / abs(math.tan(math.radians(90.0 - bendA / 2)))
     elif LengthSpec == "Outer Sharp":
-        extLen -= (bendR + thk) / math.tan(math.radians(90.0 - bendA / 2))
+        extLen -= (bendR + thk) / abs(math.tan(math.radians(90.0 - bendA / 2)))
 
     nogaptrimedgelist = []
     if not (sketches):
@@ -1781,7 +1787,9 @@ def addVerifyProperties(self, obj, refAngOffset=None, checkRefFace=False):
             obj,
             "BendType",
             translate("App::Property", "Bend Type"),
-            ["Material Outside", "Material Inside", "Thickness Outside", "Offset"],
+            ["Material Outside", "Material Inside V2", "Thickness Outside V2", "Offset",
+             # legacy modes
+             "Material Inside", "Thickness Outside"],
         )
         SheetMetalTools.smAddEnumProperty(
             obj,