LONGER LK4 User manual

LK4 Instruction Manual
Longer

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Catalog
A. Product information........................................................................................................................3
(1) Model parameter................................................................................................................... 3
(2) Packing List............................................................................................................................. 4
(3) Nozzle module exploded view............................................................................................... 5
(4) Machine assembly................................................................................................................. 6
B．Machine operation....................................................................................................................11
（1）Machine control.............................................................................................................. 11
（2）Main interface................................................................................................................. 12
C. Installation and use of Changlang 3D slicing software............................................................ 13
(1) Software installation............................................................................................................ 13
(2) Model selection................................................................................................................... 13
(3) Software usage introduction............................................................................................... 15
(4) Detailed software parameters............................................................................................. 15
(5) Export gcode format for printing.........................................................................................16
D. Instructions for printing online..................................................................................................... 17
(1) Printer connection............................................................................................................... 17
(2) Software settings................................................................................................................. 17
(3) Online printing..................................................................................................................... 18
(4) Professional settings............................................................................................................ 19
E．Resume printing and filament run-out detection function...................................................... 20
（1）Power outage recovery................................................................................................... 20
（2）Filament run-out detection.............................................................................................20
F．FAQ manual............................................................................................................................... 22
Question1: How to update the firmware?.........................................................................22
Question 2:What if the filament does not discharge from the machine?.................... 22
Question 3: When the machine returns the filament, it can't be returned. What should
I do when stuck in the pneumatic joint?............................................................................. 23
Question 4: What should I do if I cannot resume printing after power shutdown?..... 23
Question 5: When the machine is leveling, the nozzle moves to the left, it can be
leveled normally. When the nozzle moves to the right, it is found that the distance
between the nozzle and the heated bed are very far or very close. If the spring is
adjusted to the extreme position, it still cannot be leveled. What should I do?........... 24

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Safety Precautions
1) The temperature of the nozzle parts can reach 250 °C during the
operation of the machine. To ensure your safety, it is forbidden to touch
the model and nozzle directly with your hand while the printer is
printing or cooling.
2) During the operation of the machine, it is forbidden to reach into the
machine to prevent pinching.
3) The working voltage is 110~220V AC voltage 50HZ AC. The three-pin
socket must be grounded. Do not use other power sources to avoid
damage to components or fire, electric shock and other accidents.
Note: Before powering on, please check whether the input voltage value
of the switching power supply meets the voltage standard of the country
or region.
4) When the machine is working continuously for ≥ 96 hours, it should
be stopped for 1-3 hours.
Consumables
The consumables are not used after unpacking or for a long period of
time after the print model is completed. The consumables should be
taken out of the printer and sealed to prevent the consumables from
being exposed to the air for a long time, causing moisture and affecting
the print quality. At the same time, when the consumables are removed

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The front end of the consumable should be fixed on the tray to avoid
consumables and affect the next print.
To use this printer, it is recommended to use the supplies provided by
the company. At present, the quality of consumables sold in the retail
market is uneven, and printing is prone to breakage.
Staggering and clogging the printer nozzle, etc., and irreversible damage
to the heating components of the nozzle, the extrusion motor and the
extrusion gear. The company will not guarantee the printer due to the
use of consumables other than our company.
Environmental requirements
Temperature requirement: 10°C~30°C, humidity requirement: 20%~50%,
this 3D printer can work normally within this range; beyond this range,
this 3D printer will unable to achieve the best print results.

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A.Product information
(1) Model parameter
model
LK4
Machine size
402*382*655mm
frame
Classic aluminum
frame
Machine weight
7.8KG
Molding
FDM (hot melt
production)
Package
dimensions
507*467*190mm
Number of nozzles
1
Consumable color
Multi-color
optional
Molding size
220*220*250mm
Power requirement
Output 24V
Layer thickness
0.1-0.4mm
operating system
Windows,Linux,MAC
Memory card offline
printing
Support TF card
Interface
language
English
LCD screen
YES
Environmental
requirements
Temperature 10-30 °
C
Humidity 20-50%
printing speed
Not more than
120mm/s
Nozzle
temperature
Room temperature to
250 ° C
Nozzle diameter
0.4mm
Hot bed
3mm thick integrated
heating aluminum
plate, forming
platform
Slicing software
Cura,repetier-host
Support
consumables
PLA, ABS, wood,
copper consumables
file format
STL,G-Code,OBJ
Consumable
diameter
1.75mm

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(2) Packing List

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(3) Nozzle module exploded view
Quick pneumatic joint
Heat sink
Heating block
nozzle
Heater
Thermistor
Sheet metal protective case
3010 fan
4010 fan
Air guide

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(4) Machine assembly

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B．Machine operation
（1）Machine control
LK4
Move Head
±X.±Y.±Z（move）
±X.±Y.±Z（正负移动）
X.Y.Z（home）
Motor unlock
Moving distance adjustment
Return
Files
Start printing
Page flip
Return
Print interface
Pause printing
Parameter
Stop printing
暂停打印
喷嘴温度
Hotbed temperature
speed of fan
Nozzle temperature
printing speed
Discharge flow
distance
more
return
Extrud
e
Hotbed temperature
Nozzle temperature
Slow in and out
Automatic feeding and discharging
料
Adjustment distance
stop
Leveling
Top left
Bottom left
Top right
Bottom
Unlock the X.Y motor
Return

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（2）Main interface
返回
More
Click on the file to enter
Refresh
Return
Save
Page flip
Recovery
Power failure recovery
Controls the movement of
the X, Y, and Z
coordinates, whether the
motor is locked, the moving
distance of the nozzle, and
the amount of ejection.
Open the print file
and print interface.
Controls the temperature
of the nozzle and the
heating platform, and
controls the entry or exit
of the material.
Auxiliary leveling function,
which can be automatically
moved to the corresponding
position for easy leveling.
Power failure recovery
More parameter adjustment

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C. Installation and use of Changlang 3D
slicing software
(1) Software installation
Click to enter the next step, select the default C drive for installation, otherwise the software will not open
normally
Double-click the LONGER 3D Slicer to enter the installation guide page
Follow the software installation guide reminder and click Next to complete the
installation.

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(2) Model selection
Open the software and choose the language you want
According to the model of the machine purchased, select the corresponding model. Incorrect
selection will cause the machine parameters to be incorrect and the printer will not work properly.
If it is a machine of another brand, you can also choose other models for related settings or use it.

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(3) Software usage introduction
(4) Detailed software parameters
Layer thickness: 0.1 ~ 0.4mm, high accuracy of 0.1mm, long printing time, generally 0.2mm, low
accuracy of 0.4mm, short printing time.
Wall thickness: set to 0.4mm is very thin, generally set to 1.2 high, it will be firm, and printing
time will increase.
Turn on rollback: The purpose of thread withdrawal is to prevent the silk from leaking out when
printing quickly, otherwise it will affect the appearance.
Bottom / Top Thickness: To make the top print more perfect, the bottom is flat.
Fill density: If the intensity is not very high, 20% is fine; if the intensity is high, increase it, and the
printing time will increase.
Printing speed: Generally set between 30-100, the higher the speed, the lower the accuracy.
Printing temperature: depending on the material, it is generally 190 ~ 210 degrees.
Support types: divided into semi-supported and full-supported. Models that have suspensions
relative to the structure usually require additional support, but the surface will be relatively
unsightly after removing the support.
Adhesion platform: "None" adds nothing; the "bottom edge" edge increases the bottom area;
the "bottom mesh" base makes the model adhere more firmly. In order to make the model stick
to the base better, add a base plate or edge. It is best to add a base and edge to the model with a
small base area.
Diameter: 1.75mm Flow: 100%
3D printer supports gcode format files, so you need to import the STL format model into Changlang 3D slicing
software for slicing operation. To print a fine model, you need to have a deep understanding of the slicing software
that controls the print path. Print out the various models you want, and set each parameter of the machine to the
parameter bar to pop up the corresponding explanation.

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Nozzle aperture: 0.4mm.
Retraction speed: the speed of retraction when printing the model.
Retracted length: The length of the material withdrawn, generally 4.5 ~ 8mm.
Initial layer thickness: Print the thickness of the first layer, which is the default.
Initial layer line width: 100% will be thicker and denser, just default.
Bottom Cut: The length of the bottom cut of the model.
Two extrusion overlaps: 0.15mm. By default.
Idling speed: The moving speed of the nozzle when it does not squeeze consumables.
Bottom speed: The speed of printing the first layer. The slower speed is that the model is better
attached to the bottom surface.
Filling speed / top / bottom speed / shell speed / inner wall speed: The default is 0, which is the
same as the printing speed.
Minimum print time for each layer: The default is sufficient.
Turn on fan cooling: Turn on the nozzle cooling fan.
(5) Export gcode format for printing
After setting the parameters such as whether to add support according to different models, first
adjust the model preview mode into a layer preview format to see if there are broken surfaces and path
errors. After checking that it is correct, import the gcode file into the TF card, and then insert the printer
Card slot.

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D. Instructions for printing online
Changlang 3D printers support online printing operations, but because the computer sends
instructions continuously for a long time, there are many different settings on the personal
computer (some computers will set the energy-saving mode or the screen mode, etc.) and the
computer will freeze if it runs. The interruption fails, and online printing is generally not
recommended.
TF card offline printing is a very stable and mature printing method, and it does not occupy
the computer. It is recommended to choose offline printing as much as possible. If you need to
know more about the printer, you can print online according to the following steps.
(1) Printer connection
(2) Software settings
Prepare a data cable with one end connected to the printer serial port and one end to the
computer USB port. Plug in the power cord and turn on the switch.

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(3) Online printing
Open the Changlang 3D slicing software. The first step is to turn on the model. The second
step is to open the model settings. The third step is to select the serial port number displayed by
each computer. Generally, the larger serial port is selected. Normally select "AUTO" for the
special rate. If you still cannot connect normally, select 115200. After the port is selected
correctly in step 5, the original U disk icon will change to a printer icon. At this time, the printer is
connected。
After slicing the model to be printed, open the file in the first step and directly select the
print in the second step. If the printer is connected at this time, the print status bar will pop up.
If there is no connection, the save gcode code will pop up. In the third step, click print. At that
time, the temperature of the hot bed and the temperature of the print head will rise to the set
temperature, and then printing will start。