Longer 3D LK4 Pro

Cura 4.4

Printer settings

Custom printer

X(Width): 220 mm
Y(Depth): 220 mm
Z(Width): 250 mm

Heated bed [X]

Start G-code

Add G90 code at the beginning

G90
G28 ;Home
G1 Z15.0 F6000 ;Move the platform down 15mm
[...]

Extruder settings

Nozzle size: 0.4 mm
Material diameter: 1.75 mm

Octoprint connection plugins

Install the Octoprint connection plugins.
Restart Cura is required.

In printer settings,

Firmware updates

Motherboard firmware updates can be done with Cura in Printer settings > Upload firmware.

Marlin 2.0 WIP
Modified Firmware from https://github.com/DaGr70/Marlin_Longer_LK4_pro to make it work without BLTouch.
Screen need to be updated also.

diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index b92aa85..76f7b5a 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -670,7 +670,7 @@
#define X_MAX_ENDSTOP_INVERTING false // Set to true to invert the logic of the endstop.
#define Y_MAX_ENDSTOP_INVERTING false // Set to true to invert the logic of the endstop.
#define Z_MAX_ENDSTOP_INVERTING false // Set to true to invert the logic of the endstop.
-#define Z_MIN_PROBE_ENDSTOP_INVERTING false  //  For Alphawise and Longer U30 pro LK4 pro
+#define Z_MIN_PROBE_ENDSTOP_INVERTING true  //  For Alphawise and Longer U30 pro LK4 pro

/**
* Stepper Drivers
  @@ -885,7 +885,8 @@
* Use G29 repeatedly, adjusting the Z height at each point with movement commands
* or (with LCD_BED_LEVELING) the LCD controller.
  */
  -//#define PROBE_MANUALLY
  +#define PROBE_MANUALLY
  +#define HAS_BED_PROBE 1
  //#define MANUAL_PROBE_START_Z 0.2

/**
@@ -913,7 +914,7 @@
/**
* The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
  -#define BLTOUCH   //  For Alphawise and Longer U30 pro LK4 pro with BLtouch
  +// #define BLTOUCH   //  For Alphawise and Longer U30 pro LK4 pro with BLtouch

/**
* Pressure sensor with a BLTouch-like interface
  @@ -1043,18 +1044,18 @@
*     But: `M851 Z+1` with a CLEARANCE of 2  =>  2mm from bed to nozzle.
*/
#define Z_CLEARANCE_DEPLOY_PROBE   10 // Z Clearance for Deploy/Stow
-#define Z_CLEARANCE_BETWEEN_PROBES  5 // Z Clearance between probe points
-#define Z_CLEARANCE_MULTI_PROBE     5 // Z Clearance between multiple probes
-//#define Z_AFTER_PROBING           5 // Z position after probing is done
+// #define Z_CLEARANCE_BETWEEN_PROBES  5 // Z Clearance between probe points
+// #define Z_CLEARANCE_MULTI_PROBE     5 // Z Clearance between multiple probes
+// //#define Z_AFTER_PROBING           5 // Z position after probing is done

-#define Z_PROBE_LOW_POINT          -2 // Farthest distance below the trigger-point to go before stopping
+// #define Z_PROBE_LOW_POINT          -2 // Farthest distance below the trigger-point to go before stopping

-// For M851 give a range for adjusting the Z probe offset
-#define Z_PROBE_OFFSET_RANGE_MIN -20
-#define Z_PROBE_OFFSET_RANGE_MAX 20
+// // For M851 give a range for adjusting the Z probe offset
+// #define Z_PROBE_OFFSET_RANGE_MIN -20
+// #define Z_PROBE_OFFSET_RANGE_MAX 20

// Enable the M48 repeatability test to test probe accuracy
-#define Z_MIN_PROBE_REPEATABILITY_TEST
+// #define Z_MIN_PROBE_REPEATABILITY_TEST

// Before deploy/stow pause for user confirmation
//#define PAUSE_BEFORE_DEPLOY_STOW

0.3.2
Changelog
```
...
```

Issues

~~Random abnormal temperature error~~ Fixed with the 0.3.2 update.
Very noisy fans

Resources

Longer LK4 Pro files : https://drive.google.com/drive/folders/1dvHLv4zWOcAh2wGPTkmM-cPpN2BUfJWg

1300371/3dprinter-longer-lk4