update libslic3r

src/libslic3r/CustomGCode.hpp

@@ -1,8 +1,11 @@
 #ifndef slic3r_CustomGCode_hpp_
 #define slic3r_CustomGCode_hpp_
 
+#include <stddef.h>
 #include <string>
 #include <vector>
+#include <utility>
+#include <cstddef>
 
 namespace Slic3r {
 
@@ -10,6 +13,11 @@ class DynamicPrintConfig;
 
 namespace CustomGCode {
 
+/* For exporting GCode in GCodeWriter is used XYZF_NUM(val) = PRECISION(val, 3) for XYZ values. 
+ * So, let use same value as a permissible error for layer height.
+ */
+constexpr double epsilon() { return 0.0011; }
+
 enum Type
 {
     ColorChange,
@@ -90,6 +98,7 @@ std::vector<std::pair<double, unsigned int>> custom_tool_changes(const Info& cus
 // Return pairs of <print_z, 1-based extruder ID> sorted by increasing print_z from custom_gcode_per_print_z.
 // Where print_z corresponds to the layer on which we perform a color change for the specified extruder.
 std::vector<std::pair<double, unsigned int>> custom_color_changes(const Info& custom_gcode_per_print_z, size_t num_extruders);
+
 } // namespace CustomGCode
 
 } // namespace Slic3r