diff --git a/CMakeLists.txt b/CMakeLists.txt
index 70ec0e519..769573b8e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,6 +37,7 @@ ENDIF(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
 
 option(BUILD_TESTING "Enable and build tests" ON)
 option(INSTALL_COMPACT_FILES "Copy compact files to install area" OFF)
+option(INSTALL_BEAMPIPE_STL_FILES "Download CAD files for building the detailed beampipe" OFF)
 
 #++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
@@ -194,3 +195,47 @@ write_basic_package_version_file(
 install(FILES ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_CMAKEDIR}/k4geoConfig.cmake
               ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_CMAKEDIR}/k4geoConfigVersion.cmake
         DESTINATION ${CMAKE_INSTALL_CMAKEDIR} )
+
+if(INSTALL_BEAMPIPE_STL_FILES)
+
+    set(STL_FILES
+          "AlBeMet162_30042024.stl"
+          "Copper_pipe_28092023.stl"
+          "Gold_19042024.stl"
+          "Paraffine_19042024.stl"
+          "Tungsten_mask_02102023.stl"
+          "Water_30042024.stl"
+        )
+    # Set main FCC url
+    set(FCC_URL "https://fccsw.web.cern.ch/fccsw/filesForSimDigiReco")
+    set(STL_PATH "MDI/MDI_o1_v01/stl_files/Pipe_240430")
+
+    # Set the output directory where the file will be placed
+    set(OUTPUT_DIR "${CMAKE_BINARY_DIR}/${STL_PATH}")
+    file(MAKE_DIRECTORY ${OUTPUT_DIR})
+
+    set(FILES_DOWNLOADED)
+
+    foreach(STL_FILE ${STL_FILES})
+        set(FULL_URL "${FCC_URL}/${STL_PATH}/${STL_FILE}")
+        message(DEBUG "Downloading file ${FULL_URL}")
+        set(OUTPUT_FILE "${OUTPUT_DIR}/${STL_FILE}")
+
+        # Download the file
+        file(DOWNLOAD ${FULL_URL} ${OUTPUT_FILE}
+          SHOW_PROGRESS
+          STATUS download_status)
+
+        list(GET download_status 0 status_code)
+        if(NOT status_code EQUAL 0)
+            list(GET download_status 1 error_message)
+            message(FATAL_ERROR "Failed to download file: ${error_message}")
+        endif()
+        list(APPEND FILES_DOWNLOADED "${FULL_URL}")
+
+    endforeach()
+
+    file(MAKE_DIRECTORY share/k4geo/FCCee)
+    INSTALL(DIRECTORY ${OUTPUT_DIR} DESTINATION share/k4geo/FCCee/MDI/compact/MDI_o1_v01/stl_files )
+
+endif()
diff --git a/FCCee/MDI/compact/README.md b/FCCee/MDI/compact/README.md
index 0b177c6d5..13222dae2 100644
--- a/FCCee/MDI/compact/README.md
+++ b/FCCee/MDI/compact/README.md
@@ -5,9 +5,10 @@ aciarma - 08/07/24
 -- BeamInstrumentation_o1_v01.xml : compensating and screening solenoids
 -- HOMAbsorber.xml : old model of the HOM absorbers. Not needed anymore with new low impedance beam pipe.
 
-- MDI_o1_v01 (STL FILES NOT IN THIS REPO!!! WILL BE ADDED LATER)
+- MDI_o1_v01
 -- Beampipe_CADimport_o1_v02.xml : import CAD models for engineered beam pipe (by F. Fransesini/INFN-LNF)
-These .stl files are hosted [here](https://fccsw.web.cern.ch/fccsw/filesForSimDigiReco/MDI/MDI_o1_v01/)
+These .stl files are hosted [here](https://fccsw.web.cern.ch/fccsw/filesForSimDigiReco/MDI/MDI_o1_v01/).
+The CMake option `INSTALL_BEAMPIPE_STL_FILES=ON` downloads these STL.
 -- stl_files/Pipe_240430
     ├── AlBeMet162_30042024.stl    : central and elliptoconical chambers, with cooling manifolds 
     ├── Copper_pipe_28092023.stl   : low impedance beam pipe separation region
@@ -15,4 +16,4 @@ These .stl files are hosted [here](https://fccsw.web.cern.ch/fccsw/filesForSimDi
     ├── Paraffine_19042024.stl     : cooling for central chamber
     ├── Tungsten_mask_02102023.stl : SR masks 2.1m upstream
     └── Water_30042024.stl         : cooling for elliptoconical chambers
--- BeamInstrumentation_o1_v01.xml : compensating and screening solenoids
\ No newline at end of file
+-- BeamInstrumentation_o1_v01.xml : compensating and screening solenoids