diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index d47cdf99f..5af247780 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -717,7 +717,7 @@ Print::ApplyStatus Print::apply(const Model &model, const DynamicPrintConfig &co
     if (model.id() != m_model.id()) {
         // Kill everything, initialize from scratch.
         // Stop background processing.
-        this->call_cancell_callback();
+        this->call_cancel_callback();
         update_apply_status(this->invalidate_all_steps());
         for (PrintObject *object : m_objects) {
             model_object_status.emplace(object->model_object()->id(), ModelObjectStatus::Deleted);
@@ -749,7 +749,7 @@ Print::ApplyStatus Print::apply(const Model &model, const DynamicPrintConfig &co
         } else {
             // Reorder the objects, add new objects.
             // First stop background processing before shuffling or deleting the PrintObjects in the object list.
-            this->call_cancell_callback();
+            this->call_cancel_callback();
             update_apply_status(this->invalidate_step(psGCodeExport));
             // Second create a new list of objects.
             std::vector<ModelObject*> model_objects_old(std::move(m_model.objects));
@@ -859,7 +859,7 @@ Print::ApplyStatus Print::apply(const Model &model, const DynamicPrintConfig &co
             model_object.assign_copy(model_object_new);
         } else if (support_blockers_differ || support_enforcers_differ) {
             // First stop background processing before shuffling or deleting the ModelVolumes in the ModelObject's list.
-            this->call_cancell_callback();
+            this->call_cancel_callback();
             update_apply_status(false);
             // Invalidate just the supports step.
             auto range = print_object_status.equal_range(PrintObjectStatus(model_object.id()));
@@ -960,7 +960,7 @@ Print::ApplyStatus Print::apply(const Model &model, const DynamicPrintConfig &co
             }
         }
         if (m_objects != print_objects_new) {
-            this->call_cancell_callback();
+            this->call_cancel_callback();
 			update_apply_status(this->invalidate_all_steps());
             m_objects = print_objects_new;
             // Delete the PrintObjects marked as Unknown or Deleted.
diff --git a/src/libslic3r/PrintBase.hpp b/src/libslic3r/PrintBase.hpp
index e70edd20d..e01b678a5 100644
--- a/src/libslic3r/PrintBase.hpp
+++ b/src/libslic3r/PrintBase.hpp
@@ -326,7 +326,7 @@ protected:
 
     tbb::mutex&            state_mutex() const { return m_state_mutex; }
     std::function<void()>  cancel_callback() { return m_cancel_callback; }
-	void				   call_cancell_callback() { m_cancel_callback(); }
+	void				   call_cancel_callback() { m_cancel_callback(); }
 
     // If the background processing stop was requested, throw CanceledException.
     // To be called by the worker thread and its sub-threads (mostly launched on the TBB thread pool) regularly.
diff --git a/src/libslic3r/SLAPrint.cpp b/src/libslic3r/SLAPrint.cpp
index 213437612..473df09e8 100644
--- a/src/libslic3r/SLAPrint.cpp
+++ b/src/libslic3r/SLAPrint.cpp
@@ -182,7 +182,7 @@ SLAPrint::ApplyStatus SLAPrint::apply(const Model &model, const DynamicPrintConf
     if (model.id() != m_model.id()) {
         // Kill everything, initialize from scratch.
         // Stop background processing.
-        this->call_cancell_callback();
+        this->call_cancel_callback();
         update_apply_status(this->invalidate_all_steps());
         for (SLAPrintObject *object : m_objects) {
             model_object_status.emplace(object->model_object()->id(), ModelObjectStatus::Deleted);
@@ -211,7 +211,7 @@ SLAPrint::ApplyStatus SLAPrint::apply(const Model &model, const DynamicPrintConf
         } else {
             // Reorder the objects, add new objects.
             // First stop background processing before shuffling or deleting the PrintObjects in the object list.
-            this->call_cancell_callback();
+            this->call_cancel_callback();
             update_apply_status(this->invalidate_step(slapsRasterize));
             // Second create a new list of objects.
             std::vector<ModelObject*> model_objects_old(std::move(m_model.objects));
@@ -380,7 +380,7 @@ SLAPrint::ApplyStatus SLAPrint::apply(const Model &model, const DynamicPrintConf
     }
 
     if (m_objects != print_objects_new) {
-        this->call_cancell_callback();
+        this->call_cancel_callback();
         update_apply_status(this->invalidate_all_steps());
         m_objects = print_objects_new;
         // Delete the PrintObjects marked as Unknown or Deleted.
@@ -436,7 +436,7 @@ void SLAPrint::set_task(const TaskParams &params)
 				}
 		}
 		if (!running)
-			this->cancel_callback();
+			this->call_cancel_callback();
 
 		// Now the background process is either stopped, or it is inside one of the print object steps to be calculated anyway.
 		if (params.single_model_instance_only) {
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 5056fe72e..4da9f6652 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -2036,8 +2036,9 @@ unsigned int Plater::priv::update_background_process(bool force_validation)
     //background_process.is_export_scheduled() - byl zavolan "Export G-code", background processing ma jmeno export souboru
     //background_process.is_upload_scheduled() - byl zavolan "Send to OctoPrint", jeste nebylo doslajsovano (pak se preda upload fronte a background process zapomene)
     //background_process.empty() - prazdna plocha
-    // pokud (invalidated != Print::APPLY_STATUS_UNCHANGED) a ! background_process.empty() -> je neco ke slajsovani (povol tlacitko)
-    // pokud (return_state & UPDATE_BACKGROUND_PROCESS_INVALID) != 0 -> doslo k chybe (gray out "Slice now")
+    // pokud (return_state & UPDATE_BACKGROUND_PROCESS_INVALID) != 0 -> doslo k chybe (gray out "Slice now") mozna "Invalid data"???
+    // jinak background_process.running() -> Zobraz "Slicing ..."
+    // jinak pokud ! background_process.empty() && ! background_process.finished() -> je neco ke slajsovani (povol tlacitko) "Slice Now"
 
     return return_state;
 }