Elegoo Neptune 4 Review — Fast Budget Printing With Rough Edges

The Elegoo Neptune 4 brought Klipper firmware and 500 mm/s speed capability to the sub-$250 price range. For a company best known for resin printers, this was a bold move into FDM territory that directly challenged Creality's budget dominance. The Neptune 4 promised modern speed at old-school prices.

It mostly delivers — with some caveats that the spec sheet conveniently omits.

Specs at a Glance

| Specification | Elegoo Neptune 4 | |--------------|-----------------| | Build volume | 225 x 225 x 265 mm | | Max print speed | 500 mm/s | | Max acceleration | 10,000 mm/s² | | Layer resolution | 50 microns minimum | | Nozzle | 0.4mm (direct drive) | | Bed leveling | Automatic (11x11 mesh, strain gauge) | | Filament sensor | Yes | | Power recovery | Yes | | Frame | Open (bed-slinger) | | Connectivity | USB, microSD | | Display | 4.3-inch touchscreen | | Firmware | Klipper-based (Elegoo OS) | | Price | ~$199-229 |

Wait — It Is a Bed-Slinger?

Yes. Unlike the Ender 3 V3 which went CoreXY, the Neptune 4 is a traditional bed-slinger with the heated bed moving on the Y-axis. Elegoo compensated for this with Klipper's input shaping, which does a surprisingly good job of managing the ringing artifacts that fast bed movement creates.

But physics is physics. A heavy bed moving at 500 mm/s creates forces that no amount of software can fully compensate for. The Neptune 4 is fast for a bed-slinger, but it cannot match a CoreXY printer at the same speeds. Practical quality-preserving speed for most prints is 150-250 mm/s, not the 500 mm/s headline number.

Print Quality

At moderate speeds (100-200 mm/s), the Neptune 4 produces respectable prints. PLA results are good — clean walls, decent overhangs, and adequate detail for functional parts and hobby projects. The direct drive extruder handles retraction well, keeping stringing manageable.

Push past 250 mm/s and quality degrades more quickly than on CoreXY machines. The bed mass creates vibrations that input shaping can reduce but not eliminate. Tall prints at high speed are particularly vulnerable — the higher the model, the more the bed movement affects it.

The 11x11 automatic bed leveling mesh is thorough and compensates for bed warping well. First-layer quality is consistent once the mesh is dialed in.

PETG prints adequately. TPU works thanks to the direct drive extruder. ABS is not recommended — the open frame provides no temperature control, and the bed-slinger motion makes tall ABS prints prone to warping and layer splitting.

Assembly and Setup

The Neptune 4 ships partially assembled and takes 30-60 minutes to put together. Assembly is straightforward — Elegoo's instructions are clear, and the printer is simpler than older Ender 3 models.

Initial calibration is where things get interesting. The auto-leveling works, but many users report needing to manually adjust the Z-offset multiple times before getting consistent first layers. The strain gauge sensor can be sensitive to temperature, meaning your offset may drift between a cold start and a heated bed. Running the leveling after preheating to your target temperature helps.

Klipper's input shaping calibration runs automatically and usually produces good results. If you hear resonance at certain speeds, running it again after a few days of printing (once belts have settled) often improves things.

Noise

The Neptune 4 is moderately loud. The stepper motors are audible, the part cooling fans are aggressive, and the bed moving at speed creates a low rumble. It is not the loudest printer in its class, but "quiet" is not a word anyone uses to describe it.

Running prints at lower speeds (under 150 mm/s) significantly reduces noise. The relationship between speed and noise is roughly linear — halving the speed makes a noticeable difference in the sound level.

Common Issues and Complaints

Build plate warping. The stock build plate on early Neptune 4 units was a common complaint. Some users received plates that were warped enough to cause adhesion problems even with the 11x11 mesh compensation. Elegoo has improved quality control on later batches, but if you get a bad plate, a replacement PEI spring steel sheet solves the issue.

Klipper configuration access. Elegoo's Klipper implementation does not expose the full Klipper configuration through the touchscreen. Accessing advanced settings requires SSH into the printer's Linux board. This is straightforward for technical users but opaque for beginners.

No Wi-Fi. In 2026, a printer without Wi-Fi feels like an odd omission. File transfer is via USB or microSD only. Elegoo sells a Wi-Fi dongle separately, but it should be standard at this price.

Fan duct design. The stock fan duct provides uneven cooling on some overhangs. The community has designed improved fan ducts that print on the Neptune 4 itself — one of the first upgrades most owners make.

Bed-slinger limitations on tall prints. Prints over 150mm tall at high speed can show visible quality degradation as the bed mass amplifies vibration effects. Slowing down for tall prints is necessary.

Screen firmware bugs. Some users report touchscreen glitches — frozen screens, incorrect temperature readings, or unresponsive touch zones. Firmware updates have addressed most of these, but checking for the latest version after purchase is recommended.

Pros and Cons

Pros:

• Excellent price for Klipper-based printing
• Direct drive extruder handles multiple materials
• 11x11 automatic bed leveling is thorough
• Good print quality at moderate speeds
• Decent build volume (225 x 225 x 265 mm)
• Touchscreen interface
• Active community and aftermarket parts
• Input shaping works well for a bed-slinger

Cons:

• Bed-slinger design limits practical speed
• No Wi-Fi connectivity out of the box
• Build plate quality varies between units
• Stock fan duct needs improvement
• Noise at higher speeds
• Klipper configuration not easily accessible
• Open frame — no ABS printing
• 500 mm/s headline speed is not practically useful

Who Is This Printer For?

The Neptune 4 is for budget-conscious makers who want modern firmware features without spending Bambu money. If you mostly print PLA and PETG, want a decent build volume, and do not mind the bed-slinger design, the Neptune 4 offers genuine value.

It is also a solid first printer. The assembly teaches you about the machine, Klipper gives you room to grow, and the price means a mistake is not financially devastating.

Skip the Neptune 4 if: you want CoreXY speed at a similar price (get the Ender 3 V3), you need Wi-Fi (get a Bambu A1 or Ender 3 V3), you print tall parts frequently (the bed-slinger hurts quality), or you want an enclosed printer for ABS/ASA.

Value for Money

At $199-229, the Neptune 4 is competitive but no longer uniquely cheap. The Ender 3 V3 at $199-249 offers a CoreXY design with better practical speed. The Bambu A1 Mini at $199 is smaller but more polished. The Neptune 4's advantage is its build volume — it offers more printable space than either competitor at this price.

For the specific combination of budget price, decent volume, and Klipper firmware, the Neptune 4 is a reasonable choice. It is not the clear winner it was at launch, but it remains competitive.

Optimal Print Settings

For material-specific settings tuned for the Neptune 4, visit our Elegoo Neptune 4 settings guide with optimized profiles for PLA, PETG, and TPU.

Final Verdict

The Elegoo Neptune 4 is an honest budget printer. It does not pretend to be something it is not — it is a bed-slinger with Klipper that prints well at moderate speeds and costs less than a nice dinner for two. The 500 mm/s headline is marketing, the 150-250 mm/s reality is still a significant improvement over older printers, and the price makes the compromises easy to accept.

If your expectations match what the Neptune 4 actually delivers — good prints at a good price with some assembly required — you will be satisfied. Just skip the Wi-Fi dongle frustration and print from microSD.