Elegoo NEPTUNE 4 PRO User manual

User Manual for
NEPTUNE 4 PRO
3D Printer
V1.5
Pictures are only for illustration purposes. Actual production products may vary from images

Thank you for choosing the ELEGOO Product!
This User Manual has been provided for your convenience. Please read this instruction manual carefully
before using your new printer, as the precautions, information, and tips can better help you to avoid
the risk of incorrect product setup and usage.
For any questions or issues not covered in this manual, please contact us directly via our customer
support email address: [e-mail]. The ELEGOO team is always ready to provide you with
quality service.
To provide you with the best product experience, in addition to this manual, you can find supplemental
information for the operation of your new printer via:
1. The USB Drive: The digital files include a copy of this manual and all required software.
2. The ELEGOO official website: www.elegoo.com for related equipment operation, contact information,
etc.

NOTES
1. Do not place the printer in vibrating or other unstable environments, as the shaking of the machine will affect the print
quality.
2. Do not touch the nozzle and heated bed when the printer is working to prevent high-temperature burn and personal
injury.
3. After printing, please take advantage of the residual temperature of the nozzle and clean the filaments on the nozzle
with the help of tools. Do not touch the nozzle directly with your hands during cleaning to avoid burning.
4. Please do product maintenance frequently, and regularly clean the printer body with a dry cloth to wipe away dust and
sticky print material under the situation of power off.
5. The moving parts of the X and Y axes of the machine are composed of optical axes, which need to be lubricated
regularly to keep the movement smooth.
6. 3D printers contain high-speed moving parts, so be careful not to get your hands caught.
7. Children must be supervised by adults when using the machine to avoid personal injury.
8. In case of emergency, please cut off the power directly.
9. Before leveling, homing or printing, ensure that the golden PEI sheet is properly placed on the platform. Failure to do
so may result in nozzle collisions with the magnetic sheet, causing damage to both the nozzle and the magnetic sheet.
10. It is essential to ground the machine during operation. Devices that are not grounded or improperly grounded
inevitably increase the risk of electrical shock.
11. If the machine is not in use for a long period, please turn off the device and unplug the power cord.

A stepper motor of the X/Y/Z axis is not moving or making a noise when “zeroed”
① The stepper motor cable could be loose. Please recheck the wiring connection.
② The corresponding limit switch may not be triggering properly, please check whether there is any interference in the movement
of the corresponding shafts and ensure the limit switch wiring is not loose.
③Loose timing belt may result in rough motion or abnormal noise in the X/Y axis. It can be resolved by adjusting the tension of the
timing belt using the rotary knob.
Nozzle Head Assembly is exhibiting Extrusion Anomalies
① Check that the extruder stepper motor cable is not loose or disconnected.
② Check whether the set screw of the extruder gear is firmly engaged to the motor shaft.
③ The heat dissipation of the nozzle assembly may not be enough, verify temperatures and check cooling fan operation.
④ For clogged nozzles, try first heating the nozzle to 230ºC and pushing the filament by hand to remove a potential clog, or use a
fine needle to unclog the nozzle tip while it is heating up.
Model does not Adhere to the Build Platform (PEI Sheet) or is Showing Warping
① The key to whether a model can adhere (stick) to the build plate is the largely based on the printing of the first layer. When
printing the first layer if the distance from nozzle to platform is more than 0.2mm, it will seriously reduce print adhesion
② Try setting the build model first layer option in Cura to [Brim] to improve first layer adhesion, this should also be used to reduce
any cases whereby the edges of the printed model are warping or lifting off the build platform.
Model shows signs of Misaligned Printed Layers
① The travel speed of the Printer hot end assembly or Print Speed is set too fast. Please try to reduce the Print Speed
② The belts of the X/Y axis may be too loose or the synchronizer pulley is not secured tightly. Check these components.
③ The current to the Drive may be too low.
Severe Issues in Printed Model of “Stringing” or “Ringing”
① Insufficient retraction distance is causing issues, increase the retraction distance in Cura prior to Slicing.
② In many cases, if the retraction speed is too slow, you may need to set the retraction speed higher in Cura prior to Slicing.
③ When slicing your model, check the box for “Z Hop When Retracted” and set the “Z Hop Height” to about 0.25mm.
④Print temperature may be too high, which can cause certain filaments to become sticky and stringy.
If the printing temperature is too high, it can cause the filament to become too fluid and sticky, resulting in poor 3D printing quality.
In this case, lowering the printing temperature slightly can help.
Troubleshooting Guide

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Contents
Machine Parameters ---------------------------------------------------
Machine Component Diagrams -------------------------------------
Packing List ---------------------------------------------------------------
Machine Setup & Installation ----------------------------------------
Display Screen Operation Introduction------------------------
Auto-Leveling Procedure----------------------------------------------
Model (Operation) Testing -------------------------------------------
Resume Printing Function------------------------------------------
Software Installation ---------------------------------------------------
LAN(Network) Printing -------------------------------------------------
Mainboard Circuit Wiring Diagram -----------------------------

Machine Parameters
Printer Specifications
Printer Type: FDM（Fused Deposition Modeling）
Maximum Build Volume: 225X225X265(mm³)
Print Precision: ±0.1mm
Nozzle Diameter: 0.4mm
Print Speed: 30~500mm/s
Operating Temperature Specifications
Ambient Environment Temperature: 5°C~40°C
Maximum Temperature of Nozzle: 300°C
Maximum Temperature of Hotbed: 110°C
Software Specifications
Slicer Software: Cura
Input File Format: STL, OBJ
Output File Format: G-code
Interface: USB Drive, LAN (Network)
Power Supply Specifications
Input Power : 100-120V/220-240V
Output Power : 24V
Physical Specifications
Machine Size: 475*445*515mm
Net Weight: 8.9kg
1

X-Axis Limit
Switch
Z-Axis Rod
Coupling
Filament Spool
Holder Spool Holder Arm
Filament
Detector/Filament
Detection Sensor
X-Axis Belt
Tensioner
Touch Screen
Timing
Pulley
X-Axis Stepper
Motor
Z-Axis
Stepper
Motor
Y-Axis
Stepper
Motor
Power Switch
Y-Axis Belt
Tensioner
Build
Platform
Nozzle(Hoten
d) Assembly
Unit
①②
USB Drive Port
Type-C Interface
①
②LAN(Network)
Port
2
Machine Component Diagrams

ELEGOO 3D Printer
01 02
03 04 05 06 07
Fasteners
Tools
（PM4*45）3pcs
（PM3*16）2pcs
（HM5*45）4pcs
（PM4*18）2pcs
（PM4*8） 1pc
（HM4*M3*3) 1pc
（PM3*8） 4pcs
（PM4*20）3pcs
10 110908 3
Packing List
The above accessories shall be subject to actual products, and the pictures are for reference only.
Base Unit
Screen Support
Block Screen Spiral Cable Spool Holder Spool Holder
Arm
Filament Detector
The Rear
Cooling Fan Power Cable
Printhead
Gantry Frame Unit
(1.5 / 2.0 / 2.5 / 3.0 / 4.0)

① ②
From the rear, attach the Printhead assembly using two PM3 x 16
screws to affix the Printhead through the holes of the cable strain-
relief bracket and two PM3 x 8 screws to affix the underside of the
Printhead.
（PM3*8） 2pcs
Please refer to the included USB Drive for a setup and
installation instructional video.
4
From the front, affix the remaining two PM3 x 8 screws to affix
the underside of the Printhead.
Machine Setup & Installation
①
②
10
（PM3*16）2pcs
（PM3*8） 2pcs
①
②

（HM5*45）4pcs
02
01
4.0 2.5
（PM4*20）3pcs
03
③ ④
5

08
（PM4*8） 1pc
（HM4*M3*3) 1pc
2.5
06
07
3.0
（PM4*18）2pcs
2.5
⑤ ⑥
05 04
6
When installing the cable clamp,
you will need to first organize the
cables and bunch them together
before fully securing the clamp. Be
sure to leave enough slack for the
hot end to travel freely to each side
and up and down.
Filament Detection Sensor Installation:
Cable Clamp Installation:

X
X
Z
（PM4*45）3pcs
⑦ ⑧
09
7
X-Axis Limit
Switch
X-Axis
Stepper Motor
Z-Axis
Stepper Motor
Filament Detection Sensor
Please adjust the voltage
to match the local
voltage before use.

Prepare Printer
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Display Screen Operation Introduction
Leveling Toggle (36/121 points)
Lighting Control
Language Selection
Temperature Preset
Fan Control
Motor Unlock
Restore Default Settings
Machine Information
Filament Detector Control
Advanced Settings
Setup Screen
Print Files
Left & Right Page Keys
G-code File Display
Home Screen
Temperature Display
Movement, Temp, Extruder
Selection
Motor Unlock
Home All Axis
Moving distance
Set Y=0
Set Z=0
Set X=0
Temperature Display
Compensation Settings
36-point Level Display
Printer Leveling

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NOTE: The Rear Cooling Fan has three operational modes: Silent(60%), Normal(80%) & Sport(100%). Please
select a mode appropriate to your printing needs as shown in photos below.
From the Home Screen, select the Print option. Next select the Fan Icon in order to adjust the cooling fan
operational settings during the printing process.
Display Screen Operation Introduction
Operation Of The Rear Cooling Fan:
The Rear Cooling Fan is turned off when selecting the Silent mode

A4 paper
P1 P2 P3 P4
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Auto-Leveling Procedure
When first running the machine, the distance between the platform and the nozzle needs to
be calibrated in the leveling mode, which is about the thickness of a piece of A4 paper .
Note that the leveling sensor only
detects the metal platform plate, for
example, replacing the glass platform
for leveling will not produce detection
effect, which will cause the nozzle to
squeeze the platform.
lWhen the printer is powered on, select 【Level】.
lEach axis of the printer automatically returns to the home position, after entering the leveling page, place a sheet of A4 paper between the nozzle and the platform, and adjust the
height compensation values using the screen controls to increase or decrease the distance between the nozzle and the platform (P2), and slide the sheet of paper back and forth
several times, until there is a slight amount of noticeable friction generated. At this point, the center point calibration will be completed. Next, select the auxiliary leveling option
[ ] , to calibrate the 4 corner points of the platform with the same sheet of paper by adjusting the hand-twisting nuts found under the heated bed, and once again sliding the
paper until friction has been detected and the paper can be pulled out, but not slid under the nozzle. This will complete the auxiliary leveling calibration.
lAfter completing the manual auxiliary leveling process above, next select the automatic leveling option from the menu and your printer will begin the automatic calibration process.
[ ]
lYour printer will enter a heating state during the automatic calibration process as the nozzle is heated to 140ºC and the heated bed to 60ºC (Please adjust the heated bed
temperature to the recommended temperature of the filament you intend to use to ensure accurate leveling values) .
lAfter reaching the preset temperature, begin the 36-point automatic bed calibration.
lWhen completed, perform Z-axis compensation setting: Place an A4 paper between the print head and the platform. Adjust the compensation value by clicking, and gently slide the
A4 paper. When the A4 paper can be pulled out but cannot be pushed in, the leveling is complete.
lClick the save icon to save.[ ]

Printhead Feeding Verification
1. First, insert the filament through the filament detection sensor and to the
bottom of the Printhead assembly.
2. Choose [Prepare] > [Extruder] > [Load ] (the temperature of the nozzle
will be automatically heated to 200ºC.
3. After the nozzle reaches 200ºC, choose the feed option to extrude
filament material from the nozzle.
4. Clean melted filament off the nozzle and heated bed before printing.
Model (Operation) Testing
Printing Functional Test:
1. Insert the USB Drive into the printer’s USB port.
2. Choose [Print] from the main menu and select the desired file.
3. When the nozzle and heated bed reach the required
temperatures, the X, Y & Z axis will return to Zero (Home) and
begin printing.
ABC
The nozzle is
too close to the
platform, and
resulting in
under extrusion.
The extrusion
volume & distance
between the nozzle
and the heated bed
platform is proper
with uniform
adhesion
The nozzle is too far
from the platform and
the resulting adhesion is
insufficient. The model
may fall of the heated
bed platform during
printing.
NOTE: Filament with different hardness have different requirements for “spring”
strength. The spring strength of the extruder can be adjusted with an Allen
Wrench(within 2.0mm). When turning counter-clockwise, spring strength is
increased, while spring strength is decreased when turned in a clockwise direction
NOTE: When printing the test model, please observe the first layer
printing and compare against the figure on the right. In cases A and
C, the compensation settings are not properly adjusted. You can
make compensation adjustments during printing to adjust the
distance between the nozzle and the heated bed platform. In case B,
the nozzle and the platform are at the ideal printing distance and
can continue printing without any further adjustments.
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Normal Extrusion State
B
A
C
Rotating the button counter-clockwise: The
extrusion force increases, which means that the
filament is pushed out of the nozzle with more force.
Rotating the button clockwise: The extrusion force
decreases, resulting in a reduction of the force with
which the filament is pushed out of the nozzle.

①
②
③
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Adjustment of nozzle height while printing
NOTE: While printing and following this procedure for
fine-tuning the nozzle height, please ensure that you
switch the moving distance to the smaller increment
settings of 0.01mm or 0.1mm to prevent the nozzle from
potentially dragging excessively along the heated bed
platform (which can cause damage to the build plate) or
to keep filament from “hanging” in the air.
Resume Printing Function
Power Loss Recovery：
1. Your printer, has features to continue printing following a sudden interruption or loss of power (an outage) or any accidental
events (aka “switching-off” power), and this function does not need to be set manually.
2. Once power has been resumed to the printer, simply press the “Resume” option to continue printing.
NOTE: The PEI metal build plate has better overall adhesion when it is fully heated. If the power has been “Off” for too long, the
model may become easily dislodged or fall off the PEI plate very easily. In such event, the Resume Printing Function will not be able
to continue.
Filament Detection：
When the sensor detects that filament is not present, this function will inform you to replace the filament before continuing an
active print, in order to prevent a print failure due to insufficient filament material.

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Software Installation
The included “Slicer” Software program is a modified version of the Cura Open Source Slicer software that is publically available.
While you can always use any version of Cura, we strongly urge you to use the ELEGOO version of Cura in order to ensure
maximum tested compatibility with your specific ELEGOO printer.
TIP: We recommend copying the entire contents of the included USB Drive to your local computer for easier access to all of its files.
Software Installation Procedure:
1. Open the attached USB Drive and navigate into the path: \Software and Software Drivers folder \ELEGOO
Software folder and “double-click on the ELEGOO Cura application to begin the installation process.
2. Continue by following the prompts in the installation process specific to your system.
3. Finally, select the corresponding ELEGOO printer model as shown below to complete the settings process.

Instructions for Software Usage
1. Use the middle mouse wheel to zoom the
viewpoint (in and out) and hold down the middle
mouse wheel to move the platform position on
screen.
2. Press and hold the right mouse button while
moving your mouse to pivot around your
model’s viewpoint.
3. Clicking the right mouse button will bring up a
pop-up selection options menu.
Other Software Usage Tips:
Model Settings：
When printing multiple models, you can configure
individual slice settings for the specified model.
Support Structure Interception：
This feature enables you to define an intercept
region on your model to inhibit the generation
support material.
Move
Zoom
Rotate
Mirror image
Model settings
Support structure
interception
Import model
Preview Image Function:
G-code files saved in the TFT file format can
use the printer’s preview capabilities to
display a thumbnail image of the model.
Language Selection:
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Preview Image Function
Language Selection
You can change the language by accessing the
Preferences in the top menu bar. Once you
have selected the desired language, you will
need to restart the slicing software to apply the
changes.

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LAN(Network) Printing
NOTE: Using Google Chrome (on your local computer), you can enter the IP Address listed on your Printer’s Display to
access the Printer directly (eg. http://192.168.211.164). Following entry of this address, press the “Enter” key to access
the Printer’s Network page
After your Printer is plugged into your network (via a network cable in the LAN Port), power on your Printer and check the
assigned IP address through the on-screen information. It is recommended that you use Google Chrome on your local
computer to access this IP address over your local network.
NOTE: Your Printer and Your Local Computer can only be connected to the LAN (Network) over the same network segment.
You should ensure that the network wiring port on the Printer is connected, otherwise the access will fail.
LAN(Network)
Interface