diff --git a/src/meshcombiner.cpp b/src/meshcombiner.cpp
index 970f8b0a..b33b12e2 100644
--- a/src/meshcombiner.cpp
+++ b/src/meshcombiner.cpp
@@ -28,7 +28,16 @@ MeshCombiner::Mesh::Mesh(const std::vector<QVector3D> &vertices, const std::vect
                         delete cgalMesh;
                         cgalMesh = nullptr;
                     } else {
-                        m_isCombinable = true;
+						std::vector<QVector3D> fetchedVertices;
+						std::vector<std::vector<size_t>> fetchedFaces;
+						fetchFromCgalMesh<CgalKernel>(cgalMesh, fetchedVertices, fetchedFaces);
+						if (!isManifold(fetchedFaces)) {
+							qDebug() << "Mesh does not self intersect but is not manifold";
+							delete cgalMesh;
+							cgalMesh = nullptr;
+						} else {
+							m_isCombinable = true;
+						}
                     }
                 } else {
                     qDebug() << "Mesh triangulate failed";
diff --git a/src/util.cpp b/src/util.cpp
index 031295c1..7e0b9e0a 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -1,5 +1,6 @@
 #include <cmath>
 #include <QtMath>
+#include <QFile>
 #include <unordered_set>
 #include <unordered_map>
 #include "util.h"
@@ -488,3 +489,24 @@ QVector3D choosenBaseAxis(const QVector3D &layoutDirection)
         return first.first < second.first;
     })->second];
 }
+
+void saveAsObj(const char *filename, const std::vector<QVector3D> &vertices,
+	const std::vector<std::vector<size_t>> &faces)
+{
+	QFile file(filename);
+    if (!file.open(QIODevice::WriteOnly))
+		return;
+	
+	QTextStream stream(&file);
+		
+	for (std::vector<QVector3D>::const_iterator it = vertices.begin() ; it != vertices.end(); ++it) {
+        stream << "v " << (*it).x() << " " << (*it).y() << " " << (*it).z() << endl;
+    }
+    for (std::vector<std::vector<size_t>>::const_iterator it = faces.begin() ; it != faces.end(); ++it) {
+        stream << "f";
+        for (std::vector<size_t>::const_iterator subIt = (*it).begin() ; subIt != (*it).end(); ++subIt) {
+            stream << " " << (1 + *subIt);
+        }
+        stream << endl;
+    }
+}
diff --git a/src/util.h b/src/util.h
index 4ea6ac5b..2b3f0fa3 100644
--- a/src/util.h
+++ b/src/util.h
@@ -45,5 +45,7 @@ void trim(std::vector<QVector3D> *vertices, bool normalize=false);
 void chamferFace2D(std::vector<QVector2D> *face);
 void subdivideFace2D(std::vector<QVector2D> *face);
 QVector3D choosenBaseAxis(const QVector3D &layoutDirection);
+void saveAsObj(const char *filename, const std::vector<QVector3D> &vertices,
+	const std::vector<std::vector<size_t>> &faces);
 
 #endif
diff --git a/thirdparty/instant-meshes/instant-meshes-api.cpp b/thirdparty/instant-meshes/instant-meshes-api.cpp
index d78a2d57..b67ed3c3 100644
--- a/thirdparty/instant-meshes/instant-meshes-api.cpp
+++ b/thirdparty/instant-meshes/instant-meshes-api.cpp
@@ -311,6 +311,9 @@ void DUST3D_INSTANT_MESHES_FUNCTION_CONVENTION Dust3D_instantMeshesRemesh(const
         }
     };
     outputMesh(O_extr, F_extr);
+    
+    if (bvh)
+        delete bvh;
 
     *nResultVertices = g_resultVertices.size();
     *resultVertices = g_resultVertices.data();