BL-Touch Installing Guide for LK4PRO & LK5PRO
Longer LK4PRO & LK5PRO are two FDM Printers capable of producing high quality 3D prints. However, you can increase the ease and quality of printing by installing a BL-TOUCH or 3D-TOUCH compatible automatic leveling sensor.
Preparation
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Download and install the Pronterface software on your laptop:
>>pronterface-windows<< -
Download and 3D print the bracket for BL-TOUCH
a. >>Bracket for Classic PrintHead<<
b. >>Bracket for DualBlower<< -
Download and install on your printer the update firmware compatible with BL-TOUCH (check the firmware update manual if you need):
>>For LK4 PRO Classic PrintHead<<
>>For LK5 PRO Classic PrintHead<<
>>For LK4 PRO DualBlower<<
>>For LK5 PRO DualBlower<<
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Prepare a USB cable, using a piece of insulating tape, as shown in the figure:
Wiring
- Switch-off the printer
- Find the position of motherboard, then screw down the mainboard cover
- Unplug the Z-MIN wire (2 pin) from the mainboard
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Connect the sensor's cables to the motherboard, as the picture showing below
- Screw up the mainboard cover
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Remove the Z endstop switch, as picture showing below
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Screwdown left 2 screws of PrintHead module and mount the BL-TOUCH as picture showing below (follow the same step if you have DualBlower)
Configuration
- Confirm BL-TOUCH wiring and mounting is complete
- Power ON the printer
- Connect PC and printer with the modified USB-cable
- Open Pronterface software, select serial port (115200 baudrate) and connect it to the printer
Adjusting Z-Offset
- Clean up bed and nozzle, and ensure no materials stick on
- Send M851 Z0 to reset Z offset value
- Send G28 to homing XYZ axis
- Send G1 F60 Z0 to lower Z axis to the software origin
- Send M211 S0 to inactivate software endstop function
- Place a sheet of paper (0.10mm approximately) on the bed and use Pronterface to lower the nozzle 0.1mm by 0.1mm until you feel a friction between the nozzle and the sheet of paper (the paper is not to be jammed but not too free either). Then remove the sheet
- Send M114 to get current Z height value (usually negative) and take note of it. This is the z-offset value we need
- Send M851 Z-x.x to set z-offset (x.x is the value of previous value; for example, if previous value is -1.2, then send M851 Z-1.2)
- Send M500 to save current settings
- Send M211 S1 to re-activate software endstop function
- Send G28 to homing XYZ axis
- Send G1 F60 Z0 to test if Z axis could back to the actual Z origin by checking the clearance between bed and nozzle if is about 0.1 mm (thickness of a sheet of paper). If not, please repeat steps from 1 to 11.
START GCODE replacement
Inside the Slicer software (Cura, Slic3r, Simplify3D), replace the original START GCODE with the following START GCODE for BL-TOUCH.
-- BL-TOUCH START GCODE --
G21 ; metric values
G90 ; absolute positioning
M82 ; set extruder to absolute mode
M107 ; start with the fan off
; confirm BL-touch safety
M280 P0 S160 ; BL-Touch Alarm release
G4 P100 ; Delay for BL-Touch homing
G28 X0 Y0 ; move X/Y to min endstops
G28 Z0 ; move Z to min endstops
; reconfirm BL-touch safety
M280 P0 S160 ; BL-Touch Alarm realease
G4 P100 ; Delay for BL-Touch
; bed leveling
G29; Auto leveling
M420 Z5 ; set LEVELING_FADE_HEIGHT
M500 ; save data of G29 and M420
M420 S1 ; enable bed leveling
; prepare hot-end
G92 E0 ; Reset Extruder
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X0.1 Y20 Z0.3 F5000.0 ; Move to start position
G1 X0.1 Y150.0 Z0.3 F1500.0 E15 ; Draw the first line
G1 X0.4 Y150.0 Z0.3 F5000.0 ; Move to side a little
G1 X0.4 Y20 Z0.3 F1500.0 E30 ; Draw the second line
G92 E0 ; Reset Extruder
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X5 Y20 Z0.3 F5000.0 ; Move over to prevent blob squish
; -- end of BL-TOUCH START GCODE --
