diff --git a/src/Mod/Mesh/App/Core/IO/Reader3MF.cpp b/src/Mod/Mesh/App/Core/IO/Reader3MF.cpp
index 3cd6a3b644..9dd5ae1a87 100644
--- a/src/Mod/Mesh/App/Core/IO/Reader3MF.cpp
+++ b/src/Mod/Mesh/App/Core/IO/Reader3MF.cpp
@@ -176,6 +176,7 @@ bool Reader3MF::LoadBuild(XERCES_CPP_NAMESPACE_QUALIFIER DOMNodeList* nodes)
 
 bool Reader3MF::LoadItems(XERCES_CPP_NAMESPACE_QUALIFIER DOMNodeList* nodes)
 {
+    const std::size_t numEntries = 12;
     if (!nodes)
         return false;
 
@@ -193,8 +194,8 @@ bool Reader3MF::LoadItems(XERCES_CPP_NAMESPACE_QUALIFIER DOMNodeList* nodes)
                 boost::char_separator<char> sep(" ,");
                 boost::tokenizer<boost::char_separator<char> > tokens(transform, sep);
                 std::vector<std::string> token_results;
-                token_results.assign(tokens.begin(),tokens.end());
-                if (token_results.size() == 12) {
+                token_results.assign(tokens.begin(), tokens.end());
+                if (token_results.size() == numEntries) {
                     mat[0][0] = std::stod(token_results[0]);
                     mat[1][0] = std::stod(token_results[1]);
                     mat[2][0] = std::stod(token_results[2]);
diff --git a/src/Mod/Mesh/App/Core/IO/Reader3MF.h b/src/Mod/Mesh/App/Core/IO/Reader3MF.h
index 46f1007371..67da6d703d 100644
--- a/src/Mod/Mesh/App/Core/IO/Reader3MF.h
+++ b/src/Mod/Mesh/App/Core/IO/Reader3MF.h
@@ -49,7 +49,7 @@ public:
      *
      * Passes an input stream to the constructor.
      */
-    Reader3MF(std::istream &str);
+    explicit Reader3MF(std::istream &str);
 
     /*!
      * \brief Reader3MF
@@ -57,7 +57,7 @@ public:
      *
      * Passes a file name to the constructor
      */
-    Reader3MF(const std::string &filename);
+    explicit Reader3MF(const std::string &filename);
     /*!
      * \brief Load the mesh from the input stream or file
      * \return true on success and false otherwise
diff --git a/src/Mod/Mesh/App/Core/IO/Writer3MF.h b/src/Mod/Mesh/App/Core/IO/Writer3MF.h
index 9a8b0ca6df..03b9a04a11 100644
--- a/src/Mod/Mesh/App/Core/IO/Writer3MF.h
+++ b/src/Mod/Mesh/App/Core/IO/Writer3MF.h
@@ -54,14 +54,14 @@ public:
      * Passes an output stream to the constructor.
      * \param str
      */
-    Writer3MF(std::ostream &str);
+    explicit Writer3MF(std::ostream &str);
 
     /*!
      * \brief Writer3MF
      * Passes a file name to the constructor
      * \param filename
      */
-    Writer3MF(const std::string &filename);
+    explicit Writer3MF(const std::string &filename);
 
     /*!
      * \brief Add a mesh object resource to the 3MF file.
diff --git a/src/Mod/Mesh/App/Core/MeshIO.cpp b/src/Mod/Mesh/App/Core/MeshIO.cpp
index c601501df1..0999bf961a 100644
--- a/src/Mod/Mesh/App/Core/MeshIO.cpp
+++ b/src/Mod/Mesh/App/Core/MeshIO.cpp
@@ -151,7 +151,7 @@ MeshIO::Format MeshInput::getFormat(const char* FileName)
          return MeshIO::Format::SMF;
      }
      else {
-         throw Base::FileException("File extension not supported",FileName);
+         throw Base::FileException("File extension not supported", FileName);
      }
 }
 
@@ -160,9 +160,9 @@ bool MeshInput::LoadAny(const char* FileName)
     // ask for read permission
     Base::FileInfo fi(FileName);
     if (!fi.exists() || !fi.isFile())
-        throw Base::FileException("File does not exist",FileName);
+        throw Base::FileException("File does not exist", FileName);
     if (!fi.isReadable())
-        throw Base::FileException("No permission on the file",FileName);
+        throw Base::FileException("No permission on the file", FileName);
 
     Base::ifstream str(fi, std::ios::in | std::ios::binary);
 
@@ -200,7 +200,7 @@ bool MeshInput::LoadAny(const char* FileName)
             ok = LoadPLY( str );
         }
         else {
-            throw Base::FileException("File extension not supported",FileName);
+            throw Base::FileException("File extension not supported", FileName);
         }
 
         return ok;
@@ -336,7 +336,7 @@ bool MeshInput::LoadOBJ (std::istream &rstrIn)
 
     std::string line;
     float fX, fY, fZ;
-    int  i1=1,i2=1,i3=1,i4=1;
+    int  i1=1, i2=1, i3=1, i4=1;
     MeshFacet item;
 
     if (!rstrIn || rstrIn.bad())
@@ -363,9 +363,9 @@ bool MeshInput::LoadOBJ (std::istream &rstrIn)
             fX = (float)std::atof(what[1].first);
             fY = (float)std::atof(what[4].first);
             fZ = (float)std::atof(what[7].first);
-            float r = std::min<int>(std::atof(what[10].first),255) / 255.0f;
-            float g = std::min<int>(std::atof(what[11].first),255) / 255.0f;
-            float b = std::min<int>(std::atof(what[12].first),255) / 255.0f;
+            float r = std::min<int>(std::atof(what[10].first), 255) / 255.0f;
+            float g = std::min<int>(std::atof(what[11].first), 255) / 255.0f;
+            float b = std::min<int>(std::atof(what[12].first), 255) / 255.0f;
             meshPoints.push_back(MeshPoint(Base::Vector3f(fX, fY, fZ)));
 
             App::Color c(r,g,b);
diff --git a/src/Mod/Mesh/App/Core/MeshIO.h b/src/Mod/Mesh/App/Core/MeshIO.h
index 7ed54f64eb..5d59de7d76 100644
--- a/src/Mod/Mesh/App/Core/MeshIO.h
+++ b/src/Mod/Mesh/App/Core/MeshIO.h
@@ -105,7 +105,7 @@ public:
     bool LoadAny(const char* FileName);
     /// Loads from a stream and the given format
     bool LoadFormat(std::istream &str, MeshIO::Format fmt);
-    /** Loads an STL file either in binary or ASCII format. 
+    /** Loads an STL file either in binary or ASCII format.
      * Therefore the file header gets checked to decide if the file is binary or not.
      */
     bool LoadSTL (std::istream &rstrIn);