diff --git a/.github/workflows/linux-eic-shell.yml b/.github/workflows/linux-eic-shell.yml
index 97017d6a9..48b6d3b0c 100644
--- a/.github/workflows/linux-eic-shell.yml
+++ b/.github/workflows/linux-eic-shell.yml
@@ -293,7 +293,8 @@ jobs:
     strategy:
       matrix:
         option: ['m'] #, 's'] # FIXME
-        detector_config: [epic_craterlake] # FIXME
+        tolerance_mm: [0.1, 0.01]
+        detector_config: [epic_craterlake, epic_ip6_extended] # FIXME
       fail-fast: false
     steps:
     - uses: actions/checkout@v4
@@ -309,7 +310,7 @@ jobs:
         setup: install/bin/thisepic.sh
         run: |
           mkdir -p doc
-          checkOverlaps --option ${{ matrix.option }} -c ${DETECTOR_PATH}/${{ matrix.detector_config }}.xml | tee doc/overlap_check_tgeo.out
+          checkOverlaps --option ${{ matrix.option }} -t ${{ matrix.tolerance_mm }} -c ${DETECTOR_PATH}/${{ matrix.detector_config }}.xml | tee doc/overlap_check_tgeo.out
           noverlaps="$(grep -c ovlp doc/overlap_check_tgeo.out || true)"
           if [[ "${noverlaps}" -gt "0" ]] ; then echo "${noverlaps} overlaps found!" && false ; fi
 
@@ -346,7 +347,8 @@ jobs:
       - build
     strategy:
       matrix:
-        detector_config: [epic_craterlake]
+        detector_config: [epic_craterlake, epic_ip6_extended]
+        tolerance_mm: [0.1, 0.01]
       fail-fast: false
     steps:
     - uses: actions/checkout@v4
@@ -362,7 +364,7 @@ jobs:
         setup: install/bin/thisepic.sh
         run: |
           mkdir -p doc
-          python scripts/checkOverlaps.py -c ${DETECTOR_PATH}/${{ matrix.detector_config }}.xml | tee doc/overlap_check_geant4.out
+          python scripts/checkOverlaps.py -t ${{ matrix.tolerance_mm }} -c ${DETECTOR_PATH}/${{ matrix.detector_config }}.xml | tee doc/overlap_check_geant4.out
           noverlaps="$(grep -c GeomVol1002 doc/overlap_check_geant4.out || true)"
           if [[ "${noverlaps}" -gt "0" ]] ; then echo "${noverlaps} overlaps found!" && false ; fi