diff --git a/sirepo/package_data/static/js/radia.js b/sirepo/package_data/static/js/radia.js
index c7e03602d0..1c4d11a367 100644
--- a/sirepo/package_data/static/js/radia.js
+++ b/sirepo/package_data/static/js/radia.js
@@ -3894,9 +3894,16 @@ SIREPO.viewLogic('geomObjectView', function(appState, panelState, radiaService,
         panelState.showField('geomObject', 'materialFile', o.material === 'custom');
 
         panelState.enableField('geomObject', 'size', true);
+
+        if (o.type === 'stl') {
+            panelState.enableField('geomObject', 'size', false);
+            //TODO(BG): Only disables 'size' field, need to build shape to get sizes to update values (likely will need to send request since python)
+        }
+
         if (o.type !== 'extrudedPoints') {
             return;
         }
+
         for (const dim of [o.widthAxis, o.heightAxis]) {
             panelState.enableArrayField(
                 'geomObject',
diff --git a/sirepo/package_data/template/radia/geometryReport.py.jinja b/sirepo/package_data/template/radia/geometryReport.py.jinja
index fa01722ee8..f7bc6bcf62 100644
--- a/sirepo/package_data/template/radia/geometryReport.py.jinja
+++ b/sirepo/package_data/template/radia/geometryReport.py.jinja
@@ -89,18 +89,18 @@ def _add_object(o, radia_objs, id_map):
     if t == _MODEL_STL:
         g_id = radia_util.build_stl(
             filename = o.get('file'),
-            #TODO(BG) Not currently reflective
-            center=ctr,
-            #TODO(BG) Not currently reflective
+            center=o.center,
+            centroid=o.stlCentroid,
             size=sz,
             vertices=o.stlVertices,
             faces=o.stlFaces,
             magnetization=m,
             material=o.material,
             rem_mag=o.remanentMag,
-            segments=segs, #TODO: Not implemented
+            segments=segs,
             h_m_curve=o.h_m_curve,
-            #slices=o.stlSlices TODO: Not implemented
+            #TODO: Not implemented
+            #slices=o.stlSlices
         )
     if t in _OBJ_MODELS:
         for b in o.get('bevels', []):
diff --git a/sirepo/template/radia.py b/sirepo/template/radia.py
index 3675f1cf1b..93dec64a17 100644
--- a/sirepo/template/radia.py
+++ b/sirepo/template/radia.py
@@ -1660,6 +1660,7 @@ def _poly_area(pts):
         size=[1.0, 1.0, 1.0],
         stlVertices=[],
         stlFaces=[],
+        stlCentroid=[],
         # TODO(BG) Not implemented
         # stlSlices = [],
     )
@@ -1699,6 +1700,8 @@ def _poly_area(pts):
             d.stlFaces.append(list(f))
         o.stlVertices = d.stlVertices
         o.stlFaces = d.stlFaces
+        o.size = list(mesh.bounding_box.primitive.extents)
+        o.stlCentroid = mesh.centroid.tolist()
 
         # TODO(BG) Mesh slicing implementation, option for meshes with 400+ faces although will be approximation
         """
diff --git a/sirepo/template/radia_util.py b/sirepo/template/radia_util.py
index cf09aaed23..b124a5d841 100644
--- a/sirepo/template/radia_util.py
+++ b/sirepo/template/radia_util.py
@@ -309,6 +309,9 @@ def build_stl(**kwargs):
     g_id = radia.ObjPolyhdr(
         d.vertices, (numpy.array(d.faces) + 1).tolist(), d.magnetization
     )
+    center = [x - d.centroid[i] for i, x in enumerate(d.center)]
+    radia.TrfOrnt(g_id, radia.TrfTrsl([center[0], center[1], center[2]]))
+    _apply_segments(g_id, d.segments)
     radia.MatApl(g_id, _radia_material(d.material, d.rem_mag, d.h_m_curve))
     return g_id