kate G.- May 05 2024

Elegoo Neptune 4 / 4 Pro Review


Introducing the Neptune 4 and Neptune 4 Pro, two fast and affordable 3D printers that deliver impressive printing results. These new additions to the Elegoo Neptune lineup in 2023 offer remarkable features at budget-friendly prices. Starting at just $259 for the Neptune 4 and $299 for the Neptune 4 Pro, these printers are perfect for beginners venturing into 3D printing or enthusiasts looking to expand their printing capabilities. Despite their low cost, both models are packed with advanced features that ensure high-quality prints. Whether you're just starting out or looking to upgrade your printing setup, the Neptune 4 and Neptune 4 Pro offer excellent value and performance.

Assebmly & Initial Setup

With these printers, some assembly is required, but it's quick and straightforward. In fact, the assembling the Neptune 4 and 4 Pro can be finished in 15-20 minutes.

When setting up the printer, there're a few key steps to check to ensure optimal performance:

1. Tighten the nozzle:
Before installing the print head, it's recommended to tighten the nozzle. 

2. Check belt tension:
Check all belts for proper tension: belts should have some flex when pushed, neither too soft nor too rigid.

3. Fixed heatbed:
Ensure the bed doesn't wobble on the X / Y axis. If you have a loose heatbed, check the distance between the two sides of rails and adjust as needed.

Neptune 4 / 4 Pro Features

Both Neptune 4 and 4 Pro feature dual-gear direct drive extruders with dual fans and longer nozzles aimed at improving filament flow. Notably, the printers come equipped with a significant set of 4 fans at the back to ensure adequate air circulation during high-speed printing, although this results in considerable noise. However, a toggle switch allows users to turn off the fans when not printing at high speeds to reduce noise levels.

Other notable features include dual Z rods for stability, a user-friendly touchscreen interface, belt tensioners for X and Y axis, filament run-out sensor, and dual sets of LED lights for improved visibility. Additionally, the printers boast auto mesh bed leveling and adjustable knobs for precise bed leveling. For file loading, users have multiple options including USB, micro SD, and USB-C ports, although Wi-Fi connectivity and a built-in camera are absent. Nevertheless, it's possible to remotely monitor the printers via the Klipper web interface using a USB webcam.

Klipper Firmware

Despite their modest size, these bed Slinger 3D printers boast a build volume of 225x225x265mm, allowing for impressive print speeds. This is partly due to the inclusion of Klipper, a firmware that provides greater control over the printer and print settings. If you're new to working with Klipper, Elegoo offers a user-friendly starting point with pre-configured settings for these machines. However, for those who wish to fine-tune Neptune 4, 4 Pro printers further, you could also optimize these printers using Klipper.

Neptune 4 VS. Neptune 4 Pro

The main difference between the Neptune 4 and Neptune 4 Pro lies in their features. The Pro version is equipped with smooth rods for the extruder, enhancing printing smoothness. Additionally, it boasts a zoned heated bed, allowing users to heat only the necessary portion of the build plate for smaller prints, rather than the entire surface. This feature contributes to more efficient printing and energy usage. Moreover, while both printers offer fast FDM printing, the Neptune 4 Pro comes at a slightly higher price point of $299 compared to the Neptune 4, priced at $259.

Neptune 4 Neptune 4 Pro
Device size 475x445x515mm(without spool holder)
Net Weight 8.3kg 8.9kg
Build Volume 225 x 225 x 265 mm
Main Differences 500 mm/s Print Speed Two Heated Bed Areas
(100W + 150 W)
300 °C High-Temp Printing Metal Guide Rollers
Powerful Cooling Metal Top-Beam
Firmware Klipper
Print Speed max. 500 mm/s
Recommended: 250–300 mm/s
Mainboard 64-bit 1.5G Quad-Core Silent (8G Storage Space)
Extruder Direct Drive Extruder with Dual-Drive-Gear
max. Print Temperature 300 °C
max. Heated Bed Temperature 110 °C
Build Plate Magnetic PEI-Spring Steel
Levelling 2.0 Automatic Levelling over 121 Points
Cooling 2 x 4015 Fans + 4 x 4020 Fans (3 Modes: mute, normal, violent)
Guide Rollers POM Metal
Display 4.3-Inch removable, Capacitive Colour Display
Z-Axis Dual
Connectivity WLAN (optional), USB
LED Light Yes
LAN Printing Yes
Filament Sensor Yes
Resume Printing Yes
XY-Belt Tensioner Yes
Vibration Damping Yes

Print Test

Neptune 4 and 4 Pro utilized the Elegoo version of Cura, which comes pre-installed with the printers and has a preset profile. The default print speed is set to 250mm/s, but the printers are capable of reaching speeds up to 500mm/s. However, I recommend sticking to around 250mm/s or even slightly lower to maintain print quality. Despite this, I've been thoroughly impressed with the print quality achieved, particularly evident in the 18-minute Benchy prints produced by these machines.

18min Benchy

Switch Stand

Kunai Print in Place

Drop element here

Troubleshooting Guide

① The stepper cable is loose. Please recheck the wiring connection.
② The corresponding limit switch does not trigger properly, please check whether there is any interference in the movement of the correspondingshaft and whether the limit switch wire is loose.

① Check that the extruder stepper cable is not loose.
② Check whether the set screw of the extruder gear is locked to the motor shaft.
③ The heat dissipation of nozzle kit is not enough, make sure that the nozzle kit's cooling fan is working properly. ④ For clogged nozzles, try briefly heating the nozzle to 230°C and squeezing the filaments by hand to remove the clog, or use a fine needle tounclog the nozzle while it is warming up.

① The key to whether the model can stick to the platform is the filaments are attached to the platform when printing the first layer. When printingthe first layer, if the distance between the nozzle and the platform is more than 0.2mm, it will seriously reduce the model's attachment to the platform, so it needs to be adjusted. ② Set up the build platform attachment in Cura, and select the attachment type 【Brim】, which will help to enlarge the attachment surfaceandprevent warping and other problems.

① The travel speed or print speed is too fast. Please try to reduce the speed.
② The belt of X/Y axis is too loose or synchronizer pulley is not securely tight.
③ Drive current is too low.

① Insufficient retraction distance, set the retraction distance larger when slicing.
② If the retraction speed is too slow, set the retraction speed higher when slicing.
③ When slicing, tick the box "Z Hop When Retracted" and set the "Z Hop height" to about 0.25mm.
④ Print temperature is too high, which causes the filaments to become sticky.

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