diff --git a/Include/Model/Classes/NMR_Model.h b/Include/Model/Classes/NMR_Model.h
index a0713bbf..a2553de2 100644
--- a/Include/Model/Classes/NMR_Model.h
+++ b/Include/Model/Classes/NMR_Model.h
@@ -118,6 +118,7 @@ namespace NMR {
 
 		// Model Build Items
 		std::vector<PModelBuildItem> m_BuildItems;
+		std::map<std::string, PModelBuildItem> m_BuildItemMap;
 
 		// build's UUID. Empty if none defined
 		PUUID m_buildUUID;
@@ -212,6 +213,7 @@ namespace NMR {
 
 		// Build Handling
 		void addBuildItem(_In_ PModelBuildItem pBuildItem);
+		PModelBuildItem findBuildItemByUUID(_In_ const std::string & sUUID, bool bMustExist);
 		nfUint32 getBuildItemCount();
 		PModelBuildItem getBuildItem(_In_ nfUint32 nIdx);
 		// Removes a build item identified by its handle
diff --git a/Source/API/lib3mf_toolpathlayerreader.cpp b/Source/API/lib3mf_toolpathlayerreader.cpp
index dd0695a1..9441caef 100644
--- a/Source/API/lib3mf_toolpathlayerreader.cpp
+++ b/Source/API/lib3mf_toolpathlayerreader.cpp
@@ -30,9 +30,11 @@ Abstract: This is a stub class definition of CToolpathLayerReader
 
 #include "lib3mf_toolpathlayerreader.hpp"
 #include "lib3mf_toolpathprofile.hpp"
+#include "lib3mf_builditem.hpp"
 #include "lib3mf_interfaceexception.hpp"
 #include "lib3mf_customdomtree.hpp"
 
+
 using namespace Lib3MF::Impl;
 
 /*************************************************************************************************************************
@@ -111,7 +113,19 @@ bool CToolpathLayerReader::SegmentHasUniformProfile(const Lib3MF_uint32 nIndex)
 
 IBuildItem* CToolpathLayerReader::GetSegmentPart(const Lib3MF_uint32 nIndex)
 {
-	throw ELib3MFInterfaceException(LIB3MF_ERROR_NOTIMPLEMENTED);
+	NMR::eModelToolpathSegmentType eNMRType;
+	uint32_t nProfileID;
+	uint32_t nPartID;
+	uint32_t nPointCount;
+	m_pReadData->getSegmentInfo(nIndex, eNMRType, nProfileID, nPartID, nPointCount);
+	std::string sUUID = m_pReadData->mapIDtoUUID(nPartID);
+
+	auto pModel = m_pModelToolpath->getModel();
+	auto pBuildItemInstance = pModel->findBuildItemByUUID(sUUID, true);
+
+	return new CBuildItem(pBuildItemInstance);
+
+
 }
 
 std::string CToolpathLayerReader::GetSegmentPartUUID(const Lib3MF_uint32 nIndex)
diff --git a/Source/Model/Classes/NMR_Model.cpp b/Source/Model/Classes/NMR_Model.cpp
index a0a14160..28f2648d 100644
--- a/Source/Model/Classes/NMR_Model.cpp
+++ b/Source/Model/Classes/NMR_Model.cpp
@@ -329,8 +329,22 @@ namespace NMR {
 		if (m_BuildItems.size() >= XML_3MF_MAXBUILDITEMCOUNT)
 			throw CNMRException(NMR_ERROR_INVALIDBUILDITEMCOUNT);
 		m_BuildItems.push_back(pBuildItem);
+		m_BuildItemMap.insert(std::make_pair(pBuildItem->uuid()->toString(), pBuildItem));
 	}
 
+	PModelBuildItem CModel::findBuildItemByUUID(_In_ const std::string& sUUID, bool bMustExist)
+	{
+		auto iIter = m_BuildItemMap.find(sUUID);
+		if (iIter != m_BuildItemMap.end())
+			return iIter->second;
+
+		if (bMustExist)
+			throw CNMRException(NMR_ERROR_BUILDITEMNOTFOUND);
+
+		return nullptr;
+	}
+
+
 	nfUint32 CModel::getBuildItemCount()
 	{
 		return (nfUint32)m_BuildItems.size();
@@ -345,9 +359,11 @@ namespace NMR {
 
 	void CModel::removeBuildItem(_In_ nfUint32 nHandle, _In_ nfBool bThrowExceptionIfNotFound)
 	{
+
 		auto iIterator = m_BuildItems.begin();
 		while (iIterator != m_BuildItems.end()) {
 			if ((*iIterator)->getHandle() == nHandle) {
+				m_BuildItemMap.erase((*iIterator)->uuid ()->toString ());
 				m_BuildItems.erase(iIterator);
 				return;
 			}
diff --git a/Source/Model/Classes/NMR_ModelToolpathLayerReadData.cpp b/Source/Model/Classes/NMR_ModelToolpathLayerReadData.cpp
index 2f58f1c2..ccf59a75 100644
--- a/Source/Model/Classes/NMR_ModelToolpathLayerReadData.cpp
+++ b/Source/Model/Classes/NMR_ModelToolpathLayerReadData.cpp
@@ -328,7 +328,65 @@ namespace NMR {
 		TOOLPATHREADSEGMENT* pSegment = m_Segments.getData(nSegmentIndex);
 		__NMRASSERT(pSegment != nullptr);
 
-		//pSegment->
+		switch (pSegment->m_eType) {
+			case eModelToolpathSegmentType::HatchSegment: {
+
+				uint32_t nProfileID = pSegment->m_nProfileID;
+
+				uint32_t nHatchCount = pSegment->m_nPointCount / 2;
+				for (uint32_t nHatchIndex = 0; nHatchIndex < nHatchCount; nHatchIndex++) {
+
+					// The profile overrides for hatches are stored on point 1!
+					auto& point1 = getSegmentPoint(nSegmentIndex, nHatchIndex * 2 + 0);
+					if (point1.m_nProfileOverride != 0) {
+						if (point1.m_nProfileOverride != nProfileID) 
+							return false;
+					}
+
+				}
+
+				return true;
+			}
+
+			case eModelToolpathSegmentType::LoopSegment:
+			{
+				uint32_t nProfileID = pSegment->m_nProfileID;
+
+				uint32_t nPointCount = pSegment->m_nPointCount;
+				for (uint32_t nPointIndex = 0; nPointIndex < nPointCount; nPointIndex++) {
+					auto& point = getSegmentPoint(nSegmentIndex, nPointIndex);
+					if (point.m_nProfileOverride != 0) {
+						if (point.m_nProfileOverride != nProfileID)
+							return false;
+					}
+
+				}
+
+				return true;
+			}
+
+			case eModelToolpathSegmentType::PolylineSegment:
+			{
+				uint32_t nProfileID = pSegment->m_nProfileID;
+
+				uint32_t nPointCount = pSegment->m_nPointCount;
+				// On a polyline, the profile ID of the last point is not applicable...
+				for (uint32_t nPointIndex = 0; nPointIndex < nPointCount - 1; nPointIndex++) {
+					auto& point = getSegmentPoint(nSegmentIndex, nPointIndex);
+					if (point.m_nProfileOverride != 0) {
+						if (point.m_nProfileOverride != nProfileID)
+							return false;
+					}
+
+				}
+
+				return true;
+			}
+
+			default:
+				return false;
+		}
+		
 		return false;
 	}