diff --git a/src/kiri-dev/fdm/Bambu.A1 b/src/kiri-dev/fdm/Bambu.A1
index 6da6e409..3c271e93 100644
--- a/src/kiri-dev/fdm/Bambu.A1
+++ b/src/kiri-dev/fdm/Bambu.A1
@@ -30,6 +30,9 @@
         ";; END"
     ],
     "gcodePre": [
+        "; total layer number: {layers}",
+        ";; PREAMBLE",
+        ";; DEFINE BAMBU-AMS 0,1,2,3",
         "; ===== HEADER ====================================",
         "M73 P0 R24                                         ; Initial progress and time remaining",
         "M201 X12000 Y12000 Z1500 E5000                     ; Set max acceleration",
diff --git a/src/kiri-dev/fdm/Bambu.P1S b/src/kiri-dev/fdm/Bambu.P1S
index 12b66881..d30ddc02 100644
--- a/src/kiri-dev/fdm/Bambu.P1S
+++ b/src/kiri-dev/fdm/Bambu.P1S
@@ -30,6 +30,8 @@
         ";; END"
     ],
     "gcodePre": [
+        "; total layer number: {layers}",
+        ";; PREAMBLE",
         ";; DEFINE BAMBU-AMS 0,1,2,3",
         "; ===== HEADER ====================================",
         "M73 P0 R14                                         ; Initial progress and time remaining",