diff --git a/Source/Model/Classes/NMR_Model.cpp b/Source/Model/Classes/NMR_Model.cpp
index 679760cd3..f89b44eaf 100644
--- a/Source/Model/Classes/NMR_Model.cpp
+++ b/Source/Model/Classes/NMR_Model.cpp
@@ -1424,7 +1424,34 @@ namespace NMR {
 			return false;
 		}
 
-		return false;
+		if(sExtension == XML_3MF_NAMESPACE_VOLUMETRICSPEC)
+		{
+			for(size_t i = 0; i < m_ObjectLookup.size(); i++)
+			{
+				CModelMeshObject *pMeshObject =
+					dynamic_cast<CModelMeshObject *>(
+						m_ObjectLookup[i].get());
+				if(pMeshObject == nullptr ||
+					pMeshObject->getMesh() == nullptr)
+					continue;
+
+				auto volumeData = pMeshObject->getVolumeData();
+				if (!volumeData)
+					continue;
+
+				if (volumeData->hasBoundary() || volumeData->hasColor() || volumeData->getPropertyCount() > 0 || volumeData->hasComposite())
+				{
+		            return true;
+				}
+			}
+		}
+
+		if (sExtension == XML_3MF_NAMESPACE_IMPLICITSPEC)
+		{
+			if (m_FunctionLookup.size() > 0)
+				return true;
+		}
+        return false;	
 	}
 
 	nfUint32 CModel::getSliceStackCount() {
diff --git a/Source/Model/Writer/v100/NMR_ModelWriterNode100_Model.cpp b/Source/Model/Writer/v100/NMR_ModelWriterNode100_Model.cpp
index 08ee924d0..3ae5f689d 100644
--- a/Source/Model/Writer/v100/NMR_ModelWriterNode100_Model.cpp
+++ b/Source/Model/Writer/v100/NMR_ModelWriterNode100_Model.cpp
@@ -170,10 +170,20 @@ namespace NMR {
 
 		if (m_bWriteVolumetricExtension) {
 			writeConstPrefixedStringAttribute(XML_3MF_ATTRIBUTE_XMLNS, XML_3MF_NAMESPACEPREFIX_VOLUMETRIC, XML_3MF_NAMESPACE_VOLUMETRICSPEC);
+			if (m_pModel->RequireExtension(XML_3MF_NAMESPACE_VOLUMETRICSPEC)) {
+				if (sRequiredExtensions.size() > 0)
+					sRequiredExtensions = sRequiredExtensions + " ";
+				sRequiredExtensions = sRequiredExtensions + XML_3MF_NAMESPACEPREFIX_VOLUMETRIC;
+			}
 		}
 
 		if (m_bWriteImplicitExtension) {
 			writeConstPrefixedStringAttribute(XML_3MF_ATTRIBUTE_XMLNS, XML_3MF_NAMESPACEPREFIX_IMPLICIT, XML_3MF_NAMESPACE_IMPLICITSPEC);
+			if (m_pModel->RequireExtension(XML_3MF_NAMESPACE_IMPLICITSPEC)) {
+				if (sRequiredExtensions.size() > 0)
+					sRequiredExtensions = sRequiredExtensions + " ";
+				sRequiredExtensions = sRequiredExtensions + XML_3MF_NAMESPACEPREFIX_IMPLICIT;
+			}
 		}
 
 		if (m_bWriteCustomNamespaces) {