diff --git a/src/Mod/Mesh/App/AppMeshPy.cpp b/src/Mod/Mesh/App/AppMeshPy.cpp
index f4c0059e9a..e88848231d 100644
--- a/src/Mod/Mesh/App/AppMeshPy.cpp
+++ b/src/Mod/Mesh/App/AppMeshPy.cpp
@@ -269,7 +269,8 @@ private:
             exporter.reset( new ExporterAMF(outputFileName, meta, exportAmfCompressed) );
         }
         else if (exportFormat == MeshIO::ThreeMF) {
-            exporter.reset( new Exporter3MF(outputFileName) );
+            Extension3MFFactory::initialize();
+            exporter.reset( new Exporter3MF(outputFileName, Extension3MFFactory::createExtensions()) );
         }
         else if (exportFormat != MeshIO::Undefined) {
             exporter.reset( new MergeExporter(outputFileName, exportFormat) );
diff --git a/src/Mod/Mesh/App/Exporter.cpp b/src/Mod/Mesh/App/Exporter.cpp
index 7140deac27..dd39288442 100644
--- a/src/Mod/Mesh/App/Exporter.cpp
+++ b/src/Mod/Mesh/App/Exporter.cpp
@@ -257,7 +257,7 @@ void Extension3MFFactory::initialize()
     }
 }
 
-std::vector<Extension3MFPtr> Extension3MFFactory::create()
+std::vector<Extension3MFPtr> Extension3MFFactory::createExtensions()
 {
     std::vector<Extension3MFPtr> ext;
     for (const auto& it : producer) {
@@ -272,19 +272,19 @@ std::vector<Extension3MFProducerPtr> Extension3MFFactory::producer;
 
 class Exporter3MF::Private {
 public:
-    explicit Private(const std::string& filename)
-      : writer3mf(filename) {
-        Extension3MFFactory::initialize();
-        ext = Extension3MFFactory::create();
+    explicit Private(const std::string& filename,
+                     const std::vector<Extension3MFPtr>& ext)
+      : writer3mf(filename)
+      , ext(ext) {
     }
     MeshCore::Writer3MF writer3mf;
     std::vector<Extension3MFPtr> ext;
 };
 
-Exporter3MF::Exporter3MF(std::string fileName)
+Exporter3MF::Exporter3MF(std::string fileName, const std::vector<Extension3MFPtr>& ext)
 {
     throwIfNoPermission(fileName);
-    d.reset(new Private(fileName));
+    d.reset(new Private(fileName, ext));
 }
 
 Exporter3MF::~Exporter3MF()
diff --git a/src/Mod/Mesh/App/Exporter.h b/src/Mod/Mesh/App/Exporter.h
index 7ca4804f48..367c4a51ff 100644
--- a/src/Mod/Mesh/App/Exporter.h
+++ b/src/Mod/Mesh/App/Exporter.h
@@ -171,7 +171,7 @@ class MeshExport Extension3MFFactory
 public:
     static void addProducer(Extension3MFProducer* ext);
     static void initialize();
-    static std::vector<Extension3MFPtr> create();
+    static std::vector<Extension3MFPtr> createExtensions();
 
 private:
     static std::vector<Extension3MFProducerPtr> producer;
@@ -187,7 +187,7 @@ private:
 class Exporter3MF : public Exporter
 {
 public:
-    Exporter3MF(std::string fileName);
+    Exporter3MF(std::string fileName, const std::vector<Extension3MFPtr>& = {});
     ~Exporter3MF() override;
 
     bool addMesh(const char *name, const MeshObject & mesh) override;