diff --git a/src/libslic3r/SLAPrint.hpp b/src/libslic3r/SLAPrint.hpp
index 182c2f911..0cf796d07 100644
--- a/src/libslic3r/SLAPrint.hpp
+++ b/src/libslic3r/SLAPrint.hpp
@@ -88,6 +88,7 @@ class SLAPrintObject : public _SLAPrintObjectBase
 {
 private: // Prevents erroneous use by other classes.
     using Inherited = _SLAPrintObjectBase;
+    using CSGContainer = std::multiset<CSGPartForStep>;
 
 public:
 
@@ -122,6 +123,17 @@ public:
     // like hollowing and drilled holes.
     const TriangleMesh & get_mesh_to_print() const;
 
+    const Range<CSGContainer::const_iterator> get_parts_to_slice() const
+    {
+        return range(m_mesh_to_slice);
+    }
+
+    const Range<CSGContainer::const_iterator> get_parts_to_slice(SLAPrintObjectStep step) const
+    {
+        auto r = m_mesh_to_slice.equal_range(step);
+        return {r.first, r.second};
+    }
+
     sla::SupportPoints      transformed_support_points() const;
     sla::DrainHoles         transformed_drainhole_points() const;
 
@@ -331,9 +343,6 @@ private:
 
     std::vector<float>                      m_model_height_levels;
 
-    // Caching the transformed (m_trafo) raw mesh of the object
-//    TriangleMesh                            m_transformed_rmesh;
-    
     struct SupportData
     {
         sla::SupportableMesh    input; // the input
@@ -362,7 +371,7 @@ private:
     std::unique_ptr<SupportData>  m_supportdata;
 
     // Holds CSG operations for the printed object, prioritized by print steps.
-    std::multiset<CSGPartForStep> m_mesh_to_slice;
+    CSGContainer                  m_mesh_to_slice;
 
     // Holds the preview of the object to be printed (as it will look like with
     // all its holes and cavities, negatives and positive volumes unified.
diff --git a/src/libslic3r/SLAPrintSteps.cpp b/src/libslic3r/SLAPrintSteps.cpp
index 88b7926d1..f0e2e5db0 100644
--- a/src/libslic3r/SLAPrintSteps.cpp
+++ b/src/libslic3r/SLAPrintSteps.cpp
@@ -186,13 +186,6 @@ indexed_triangle_set SLAPrint::Steps::generate_preview_vdb(
     return m;
 }
 
-inline auto parts_to_slice(const std::multiset<CSGPartForStep> &parts,
-                           SLAPrintObjectStep step)
-{
-    auto r = parts.equal_range(step);
-    return Range{r.first, r.second};
-}
-
 void SLAPrint::Steps::generate_preview(SLAPrintObject &po, SLAPrintObjectStep step)
 {
     Benchmark bench;
@@ -219,7 +212,7 @@ void SLAPrint::Steps::generate_preview(SLAPrintObject &po, SLAPrintObjectStep st
         // If that fails for any of the drillholes, the voxelization fallback is
         // used.
 
-        bool is_pure_model = is_all_positive(parts_to_slice(po.m_mesh_to_slice, slaposAssembly));
+        bool is_pure_model = is_all_positive(po.get_parts_to_slice(slaposAssembly));
         bool can_hollow    = po.m_hollowing_data && po.m_hollowing_data->interior &&
                           !sla::get_mesh(*po.m_hollowing_data->interior).empty();