diff --git a/src/libslic3r/SLAPrint.cpp b/src/libslic3r/SLAPrint.cpp
index d19a71968..019c91c06 100644
--- a/src/libslic3r/SLAPrint.cpp
+++ b/src/libslic3r/SLAPrint.cpp
@@ -670,9 +670,8 @@ void SLAPrint::process()
         }
 
         // Just get the first record that is form the model:
-        auto slindex_it = po.closest_slice_record(
-                    po.m_slice_index, float(bb3d.min(Z)),
-                    std::numeric_limits<float>::infinity());
+        auto slindex_it =
+                po.closest_slice_record(po.m_slice_index, float(bb3d.min(Z)));
 
         if(slindex_it == po.m_slice_index.end())
             throw std::runtime_error(L("Slicing had to be stopped "
@@ -1272,7 +1271,7 @@ void SLAPrint::fill_statistics()
     int sliced_layer_cnt = 0;
     for (const SliceRecord& layer : highest_obj_slice_index)
     {
-        const double l_height = (layer.print_level() == highest_obj_slice_index.begin()->print_level()) ? init_layer_height : layer_height;
+        const auto l_height = double(layer.layer_height());
 
         // Calculation of the consumed material 
 
@@ -1283,9 +1282,8 @@ void SLAPrint::fill_statistics()
         {
             const SliceRecord *record = nullptr;
             {
-                const SliceRecord& slr = po->closest_slice_to_slice_level(layer.slice_level(), float(EPSILON));
-                if (!slr.is_valid())
-                    continue;
+                const SliceRecord& slr = po->closest_slice_to_slice_level(layer.slice_level());
+                if (!slr.is_valid()) continue;
                 record = &slr;
             }
 
diff --git a/src/libslic3r/SLAPrint.hpp b/src/libslic3r/SLAPrint.hpp
index 626c5ead7..88152830f 100644
--- a/src/libslic3r/SLAPrint.hpp
+++ b/src/libslic3r/SLAPrint.hpp
@@ -124,7 +124,7 @@ public:
         // Returns the current layer height
         float layer_height() const { return m_height; }
 
-        bool is_valid() const { return std::isnan(m_slice_z); }
+        bool is_valid() const { return ! std::isnan(m_slice_z); }
 
         const SLAPrintObject* print_obj() const { return m_po; }
 
@@ -158,7 +158,10 @@ private:
     //
     // This method can be used in const or non-const contexts as well.
     template<class Container, class T>
-    static auto closest_slice_record(Container& cont, T lvl, T eps) -> decltype (cont.begin())
+    static auto closest_slice_record(
+            Container& cont,
+            T lvl,
+            T eps = std::numeric_limits<T>::max()) -> decltype (cont.begin())
     {
         if(cont.empty()) return cont.end();
         if(cont.size() == 1 && std::abs(level<T>(cont.front()) - lvl) > eps)
@@ -207,22 +210,22 @@ public:
     // max_epsilon gives the allowable deviation of the returned slice record's
     // level.
     const SliceRecord& closest_slice_to_print_level(
-            coord_t print_level, coord_t max_epsilon = coord_t(SCALED_EPSILON)) const
+            coord_t print_level,
+            coord_t max_epsilon = std::numeric_limits<coord_t>::max()) const
     {
         auto it = closest_slice_record(m_slice_index, print_level, max_epsilon);
-        if (it == m_slice_index.end()) return SliceRecord::EMPTY;
-        return *it;
+        return it == m_slice_index.end() ? SliceRecord::EMPTY : *it;
     }
 
     // Search slice index for the closest slice to given slice_level.
     // max_epsilon gives the allowable deviation of the returned slice record's
-    // level.
+    // level. Use SliceRecord::is_valid() to check the result.
     const SliceRecord& closest_slice_to_slice_level(
-            float slice_level, float max_epsilon = float(EPSILON)) const
+            float slice_level,
+            float max_epsilon = std::numeric_limits<float>::max()) const
     {
         auto it = closest_slice_record(m_slice_index, slice_level, max_epsilon);
-        if (it == m_slice_index.end()) return SliceRecord::EMPTY;
-        return *it;
+        return it == m_slice_index.end() ? SliceRecord::EMPTY : *it;
     }
 
 protected:
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 78d1085e8..da62ddab0 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -5027,7 +5027,7 @@ void GLCanvas3D::_render_sla_slices() const
             // Offset to avoid OpenGL Z fighting between the object's horizontal surfaces and the triangluated surfaces of the cuts.
             double plane_shift_z = 0.002;
 
-            if (! slice_low.is_valid()) {
+            if (slice_low.is_valid()) {
                 const ExPolygons& obj_bottom = slice_low.get_slice(soModel);
                 const ExPolygons& sup_bottom = slice_low.get_slice(soSupport);
                 // calculate model bottom cap
@@ -5038,7 +5038,7 @@ void GLCanvas3D::_render_sla_slices() const
                     bottom_sup_triangles = triangulate_expolygons_3d(sup_bottom, clip_min_z - plane_shift_z, true);
             }
 
-            if (! slice_high.is_valid()) {
+            if (slice_high.is_valid()) {
                 const ExPolygons& obj_top = slice_high.get_slice(soModel);
                 const ExPolygons& sup_top = slice_high.get_slice(soSupport);
                 // calculate model top cap