diff --git a/creality-ender3/Marlin-2.1.2.4/Marlin/Configuration.h b/creality-ender3/Marlin-2.1.2.4/Marlin/Configuration.h
index 2c110da..c2c956d 100644
--- a/creality-ender3/Marlin-2.1.2.4/Marlin/Configuration.h
+++ b/creality-ender3/Marlin-2.1.2.4/Marlin/Configuration.h
@@ -1774,7 +1774,7 @@
 #if ENABLED(MIN_SOFTWARE_ENDSTOPS)
   #define MIN_SOFTWARE_ENDSTOP_X
   #define MIN_SOFTWARE_ENDSTOP_Y
-  // #define MIN_SOFTWARE_ENDSTOP_Z
+  #define MIN_SOFTWARE_ENDSTOP_Z
   #define MIN_SOFTWARE_ENDSTOP_I
   #define MIN_SOFTWARE_ENDSTOP_J
   #define MIN_SOFTWARE_ENDSTOP_K
@@ -1788,7 +1788,7 @@
 #if ENABLED(MAX_SOFTWARE_ENDSTOPS)
   #define MAX_SOFTWARE_ENDSTOP_X
   #define MAX_SOFTWARE_ENDSTOP_Y
-  #define MAX_SOFTWARE_ENDSTOP_Z
+  // #define MAX_SOFTWARE_ENDSTOP_Z
   #define MAX_SOFTWARE_ENDSTOP_I
   #define MAX_SOFTWARE_ENDSTOP_J
   #define MAX_SOFTWARE_ENDSTOP_K
diff --git a/creality-ender3/Marlin-2.1.2.4/Marlin/Configuration_adv.h b/creality-ender3/Marlin-2.1.2.4/Marlin/Configuration_adv.h
index 5d9b724..82ab1c4 100644
--- a/creality-ender3/Marlin-2.1.2.4/Marlin/Configuration_adv.h
+++ b/creality-ender3/Marlin-2.1.2.4/Marlin/Configuration_adv.h
@@ -2087,7 +2087,7 @@
     #endif
   #endif
 
-  //#define BABYSTEP_DISPLAY_TOTAL          // Display total babysteps since last G28
+  #define BABYSTEP_DISPLAY_TOTAL          // Display total babysteps since last G28
 
   #define BABYSTEP_ZPROBE_OFFSET          // Combine M851 Z and Babystepping
   #if ENABLED(BABYSTEP_ZPROBE_OFFSET)
diff --git a/creality-ender3/README.md b/creality-ender3/README.md
index 752dd0e..e90b5a6 100644
--- a/creality-ender3/README.md
+++ b/creality-ender3/README.md
@@ -5,6 +5,8 @@
 3. [Print profiles](#print-profiles)
 4. [Filament set up](#filament-set-up)
 5. [Raspberry Pi 4 / Octoprint case](#raspberry-pi-4--octoprint-case)
+6. [Marlin custom firmware](#marlin-custom-firmware)
+7. [3D printer custom parts](#3d-printed-custom-parts)
 
 # Octoprint backup archive
 
@@ -169,4 +171,38 @@ Final result:
 #
 # m h  dom mon dow   command
 @reboot raspi-gpio set 4 op dh
-```
\ No newline at end of file
+```
+
+# Marlin custom firmware
+
+## Installed firmware
+
+- Currently used tag: [`2.1.2.4`](https://github.com/MarlinFirmware/Marlin/tree/2.1.2.4)
+- Details: [Firmware sources and custom configuration](./Marlin-2.1.2.4/) (local repo)
+- Last compilation date: `2024-10-10 @ 09:53`
+
+## Useful resources
+
+### Firmware configuration:
+- [Marlin 2.0.x Firmware Guide for BTT SKR Mini E3 v2.0 Ender 3](https://wallabag.igox.org/view/202)
+- [Marlin 2.0.8 guide - PID autotune](https://wallabag.igox.org/view/203)
+- [Marlin 2.0.8 guide - Bed Leveling - BLTouch, Inductive Sensor](https://wallabag.igox.org/view/204)
+
+### Theorical documentation:
+- [[MARLIN] Déterminer les dimensions / positions de la zone d'impression de son imprimante (cartésienne / CoreXY)](https://web.archive.org/web/20241010080558/https://www.lesimprimantes3d.fr/forum/topic/47020-marlin-déterminer-les-dimensions-positions-de-la-zone-dimpression-de-son-imprimante-cartésienne-corexy/)
+- [comprendre la zone de palpage avec un ABL afin de paramétrer son Marlin](https://www.lesimprimantes3d.fr/forum/topic/43747-quelques-éléments-pour-mieux-comprendre-la-zone-de-palpage-avec-un-abl-afin-de-paramétrer-son-marlin/)
+
+### Printer calibration:
+
+Proceed with the different calibrations in the above order:
+
+- [Marlin PID Auto-Tune - A Complete Guide](https://3dprintinggeek.com/marlin-pid-tuning/) 
+    - :warnning: First do the PID Auto-Tune for the **bed**. Else you may have false positive thermal runout.
+- [Z-Offset Wizard – A Complete Guide](https://3dprintscape.com/z-offset-wizard-complete-guide/)
+- Linear Advance:
+    - [Explanation](https://marlinfw.org/docs/features/lin_advance.html)
+    - [Pattern generation tool](https://marlinfw.org/tools/lin_advance/k-factor.html)
+
+
+# 3D printed custom parts
+