diff --git a/src/libslic3r/CMakeLists.txt b/src/libslic3r/CMakeLists.txt
index 8b162a1d5..9ee6e60c5 100644
--- a/src/libslic3r/CMakeLists.txt
+++ b/src/libslic3r/CMakeLists.txt
@@ -9,6 +9,11 @@ if (MINGW)
     add_compile_options(-Wa,-mbig-obj)
 endif ()
 
+set(OpenVDBUtils_SOURCES "")
+if (TARGET OpenVDB::openvdb)
+    set(OpenVDBUtils_SOURCES OpenVDBUtils.cpp OpenVDBUtils.hpp)
+endif()
+
 add_library(libslic3r STATIC
     pchheader.cpp
     pchheader.hpp
@@ -174,6 +179,7 @@ add_library(libslic3r STATIC
     MinAreaBoundingBox.cpp
     miniz_extension.hpp
     miniz_extension.cpp
+    ${OpenVDBUtils_SOURCES}
     SLA/SLACommon.hpp
     SLA/SLABoilerPlate.hpp
     SLA/SLAPad.hpp
@@ -222,10 +228,13 @@ target_link_libraries(libslic3r
     qhull
     semver
     TBB::tbb
-    # OpenVDB::openvdb
     ${CMAKE_DL_LIBS}
     )
 
+if (TARGET OpenVDB::openvdb)
+    target_link_libraries(libslic3r OpenVDB::openvdb)
+endif()
+
 if(WIN32)
     target_link_libraries(libslic3r Psapi.lib)
 endif()
diff --git a/tests/hollowing/openvdb_utils.cpp b/src/libslic3r/OpenVDBUtils.cpp
similarity index 97%
rename from tests/hollowing/openvdb_utils.cpp
rename to src/libslic3r/OpenVDBUtils.cpp
index 62d3a14d7..a5d4f0db6 100644
--- a/tests/hollowing/openvdb_utils.cpp
+++ b/src/libslic3r/OpenVDBUtils.cpp
@@ -1,6 +1,5 @@
 #define NOMINMAX
-#include "openvdb_utils.hpp"
-
+#include "OpenVDBUtils.hpp"
 #include <openvdb/tools/MeshToVolume.h>
 #include <openvdb/tools/VolumeToMesh.h>
 
@@ -55,7 +54,7 @@ openvdb::FloatGrid::Ptr meshToVolume(const TriangleMesh &            mesh,
                                      const openvdb::math::Transform &tr)
 {
     return openvdb::tools::meshToVolume<openvdb::FloatGrid>(
-                TriangleMeshDataAdapter{mesh}, tr);
+        TriangleMeshDataAdapter{mesh}, tr);
 }
 
 openvdb::FloatGrid::Ptr meshToVolume(const sla::Contour3D &          mesh,
@@ -78,7 +77,7 @@ sla::Contour3D volumeToMesh(const openvdb::FloatGrid &grid,
     std::vector<openvdb::Vec3s> points;
     std::vector<openvdb::Vec3I> triangles;
     std::vector<openvdb::Vec4I> quads;
-
+    
     openvdb::tools::volumeToMesh(grid, points, triangles, quads, isovalue,
                                  adaptivity, relaxDisorientedTriangles);
     
diff --git a/tests/hollowing/openvdb_utils.hpp b/src/libslic3r/OpenVDBUtils.hpp
similarity index 90%
rename from tests/hollowing/openvdb_utils.hpp
rename to src/libslic3r/OpenVDBUtils.hpp
index 9854d924d..e42403887 100644
--- a/tests/hollowing/openvdb_utils.hpp
+++ b/src/libslic3r/OpenVDBUtils.hpp
@@ -1,5 +1,5 @@
-#ifndef OPENVDB_UTILS_HPP
-#define OPENVDB_UTILS_HPP
+#ifndef OPENVDBUTILS_HPP
+#define OPENVDBUTILS_HPP
 
 #include <libslic3r/TriangleMesh.hpp>
 #include <libslic3r/SLA/SLABoilerPlate.hpp>
@@ -20,4 +20,4 @@ sla::Contour3D volumeToMesh(const openvdb::FloatGrid &grid,
 
 } // namespace Slic3r
 
-#endif // OPENVDB_UTILS_HPP
+#endif // OPENVDBUTILS_HPP
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 0d2266dc5..f77b4bd25 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -27,5 +27,4 @@ add_subdirectory(libslic3r)
 add_subdirectory(timeutils)
 add_subdirectory(fff_print)
 add_subdirectory(sla_print)
-add_subdirectory(hollowing)
-add_subdirectory(example)
+# add_subdirectory(example)
diff --git a/tests/hollowing/CMakeLists.txt b/tests/hollowing/CMakeLists.txt
deleted file mode 100644
index 9679a1b77..000000000
--- a/tests/hollowing/CMakeLists.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-if(TARGET OpenVDB::openvdb)
-    add_executable(hollowing_tests hollowing_test_main.cpp hollowing_tests.cpp openvdb_utils.cpp openvdb_utils.hpp)
-
-    #find_package(GTest REQUIRED)
-    #target_link_libraries(hollowing_tests libslic3r OpenVDB::openvdb GTest::GTest GTest::Main)
-    #target_compile_definitions(hollowing_tests PRIVATE TEST_DATA_DIR=R"\(${TEST_DATA_DIR}\)")
-    
-    target_link_libraries(hollowing_tests test_common libslic3r OpenVDB::openvdb)
-endif()
diff --git a/tests/hollowing/hollowing_test_main.cpp b/tests/hollowing/hollowing_test_main.cpp
deleted file mode 100644
index b2aa80259..000000000
--- a/tests/hollowing/hollowing_test_main.cpp
+++ /dev/null
@@ -1 +0,0 @@
-#include <catch_main.hpp>
diff --git a/tests/libslic3r/CMakeLists.txt b/tests/libslic3r/CMakeLists.txt
index 98aab498e..b4f5ba01e 100644
--- a/tests/libslic3r/CMakeLists.txt
+++ b/tests/libslic3r/CMakeLists.txt
@@ -1,4 +1,5 @@
 get_filename_component(_TEST_NAME ${CMAKE_CURRENT_LIST_DIR} NAME)
+
 add_executable(${_TEST_NAME}_tests 
 	${_TEST_NAME}_tests.cpp
 	test_3mf.cpp
@@ -7,6 +8,11 @@ add_executable(${_TEST_NAME}_tests
 	test_polygon.cpp
 	test_stl.cpp
 	)
+
+if (TARGET OpenVDB::openvdb)
+    target_sources(${_TEST_NAME}_tests PRIVATE test_hollowing.cpp)
+endif()
+    
 target_link_libraries(${_TEST_NAME}_tests test_common libslic3r)
 set_property(TARGET ${_TEST_NAME}_tests PROPERTY FOLDER "tests")
 
diff --git a/tests/hollowing/hollowing_tests.cpp b/tests/libslic3r/test_hollowing.cpp
similarity index 96%
rename from tests/hollowing/hollowing_tests.cpp
rename to tests/libslic3r/test_hollowing.cpp
index a7b2874eb..0e211c33c 100644
--- a/tests/hollowing/hollowing_tests.cpp
+++ b/tests/libslic3r/test_hollowing.cpp
@@ -2,7 +2,7 @@
 #include <fstream>
 #include <catch2/catch.hpp>
 
-#include "openvdb_utils.hpp"
+#include "libslic3r/OpenVDBUtils.hpp"
 #include "libslic3r/Format/OBJ.hpp"
 
 #if defined(WIN32) || defined(_WIN32)