Elegoo Neptune 4 Ultimate Guide: An In-Depth Review by Mr Resin 🚀

Hey, maker! Mr Resin here, ready to dive into the review I know you've been waiting for: the Elegoo Neptune 4. This machine has landed in our workshops with a clear promise — blistering speed without sacrificing print quality. If you're hunting for an FDM printer that delivers serious value for money, stick around, because in my experience, this one's a top contender.

Welcome to the new era of speed

Let's cut to the chase, because the Elegoo Neptune 4 is no ordinary upgrade. It's a genuine leap forward — especially since it brings technology that was previously reserved for advanced users within everyone's reach: Klipper firmware.

So what exactly is Klipper? Think of it as fitting your printer with a supercomputer brain. It's software that lets your machine calculate movements at incredible speeds, optimising every curve and every straight line.

When I talk about speed, I'm not exaggerating. We're looking at theoretical peak speeds of 500 mm/s, though I'd recommend sticking around 250 mm/s if you want to maintain top-quality results. To put that in perspective, most entry-level printers run at 50 to 80 mm/s. Do the maths! You could be cutting your print times in half — or even down to a third. More time for you, more time to keep creating.

Of course, speed without control is pointless. That's why Elegoo has fitted a dual-gear direct drive extruder. This system pushes 3D printing filaments with real force and precision — essential for handling flexible materials like TPU and keeping everything running smoothly at high speeds.

If any of this sounds like a foreign language, don't worry — I've got you covered. Check out my ultimate beginner's guide to 3D printing, where I break down all these concepts from scratch.

A family for every need

It's worth knowing that the Neptune 4 doesn't come alone. It's the flagship of a lineup designed for different types of makers:

• Neptune 4: The standard model, with a build volume of 225x225x265 mm — more than enough for most projects.
• Neptune 4 Pro: Very similar to the base model, but with added rigidity thanks to metal linear rails on the X and Y axes, giving it a boost in durability and precision.
• Neptune 4 Plus and Max: The big siblings. If large-scale projects are your thing — think helmets, cosplay armour, or oversized parts — these are your machines. Massive build volumes so you never have to split your models.

In my opinion, getting a printer at this price point with Klipper pre-installed straight out of the box is a genuine game-changer. It saves you hours of headaches and gives you access to advanced features like Input Shaping (to eliminate ghosting/ringing artefacts) and Pressure Advance (for crisp, clean corners).

What about the Neptune 3 Pro?

A lot of people ask me whether upgrading from the Neptune 3 Pro is worth it. To give you a clear picture, here's a quick comparison table highlighting the differences you'll actually notice in day-to-day use.

Elegoo Neptune 4 vs Neptune 3 Pro at a glance

A quick comparison so you can see the most important differences between the Elegoo Neptune 4 and its popular predecessor, focusing on the upgrades that make the biggest impact in everyday printing.

As you can see, we're not talking about minor tweaks here. The Neptune 4 is in a completely different league — especially when it comes to speed and the ability to handle more technical materials, thanks to its all-metal hotend.

In this article, we're going to break down every aspect of this machine so you can decide whether it's the missing piece in your workshop setup. Let's dive in!

Assembly and calibration: up and printing in 30 minutes

There's nothing quite like the excitement of unboxing a new printer and getting it running before your coffee goes cold. With the Elegoo Neptune 4, that's not wishful thinking — it's genuinely achievable. I'll walk you through the whole process so you can have this beast printing in under half an hour.

First up: assembly. Elegoo has made this remarkably straightforward, as the printer arrives 90% pre-assembled. You're essentially just bolting the Z-axis gantry to the base and plugging in a few cables — which, helpfully, are all labelled so there's no guessing involved.

A pro tip: take a minute to check that all screws are properly tight (without overtightening) and, crucially, that the gantry is perfectly perpendicular to the base. A slight misalignment here is a guaranteed recipe for headaches down the line.

The first layer is everything

With the printer assembled, it's time for the moment of truth: calibration. And this is where the Neptune 4 really shines, with its 121-point automatic bed levelling system. Say goodbye to the paper sheet trick and fiddling with corner knobs. The printer builds a digital map of the entire bed and automatically compensates for any imperfections.

The process couldn't be simpler:

1. On the touchscreen, find the auto-levelling option. The printer will take a moment to heat the bed and nozzle before it starts probing.
2. Once that's done, it's time to dial in your Z-Offset. This is, without question, the most critical step. It tells the printer the exact distance at which it should start extruding the first layer.
3. Grab a standard sheet of printer paper. Lower the Z-Offset value in very small increments (0.01 mm at a time) until you feel the nozzle tip just grazing the paper. You're looking for a slight resistance when you slide it — but not so much that the paper tears or gets stuck.

Trust me, nailing the Z-Offset accounts for 80% of getting a perfect first layer. It's the foundation everything else builds on, so don't rush it. Take as much time as you need.

To give you a clearer picture of how this speed and precision is achieved, here's a quick overview of how the Elegoo Neptune 4's key components work together.

Klipper acts as the brain that plans everything, the extruder is the muscle that pushes filament with precision, and speed is the result of both working in perfect harmony.

Wireless connectivity for effortless control

The final step into modern 3D printing is connecting your printer to your network. Because the Elegoo Neptune 4 ships with Klipper pre-installed, it supports both WiFi and Ethernet connections — no more shuffling SD cards back and forth between your computer and printer.

Once connected, just type its IP address into your browser to access the Fluidd interface. From there, you have complete control over the machine. You're ready to run your first Benchy and see that high-speed performance in action!

If you want to see how other printers are set up, check out my complete setup guide for the Anycubic Kobra 3 Combo.

How to master Klipper: the powerhouse under the hood

This is where the Elegoo Neptune 4 flexes its muscles and leaves the competition behind. A lot of people hear the word "Klipper" and immediately feel intimidated — but don't worry! I'm here to bust that myth and explain why this firmware is the secret engine that makes this printer fly.

What is Klipper and why should you care?

Think of it this way: traditional 3D printers running firmware like Marlin are like a car with an old-school GPS. The printer's mainboard has to calculate the entire route (the G-code) on its own — and it's no supercomputer. It gets the job done, but only at its own pace.

Now imagine Klipper is like plugging your car into Waze or Google Maps on the latest smartphone. The printer's mainboard (the car) relaxes and simply follows basic commands: "accelerate," "turn here," "slow down a little." All the heavy lifting — calculating curves, pushing speeds to the limit — is handled by a far more powerful processor. On the Neptune 4, that's a dedicated ARM board acting as a mini-computer.

This simple shift in approach changes everything. It allows the printer to perform incredibly complex calculations at lightning speed, resulting in spectacular print speeds without sacrificing an ounce of precision. And what I love most is that on the Neptune 4, this system comes ready out of the box — no painful installation process, no marathon YouTube tutorial sessions required.

Welcome to Fluidd: your new command center

Once your printer is connected to your WiFi network, you can largely forget about the small touchscreen for day-to-day use. Just open a browser on your computer, type in the printer's IP address, and — like magic — you're inside Fluidd, the web interface that gives you complete control over Klipper and your Elegoo Neptune 4.

At first, all the graphs and buttons might feel a little overwhelming, but trust me — within a couple of days you'll be navigating the key areas like a pro:

• Dashboard: Your command center. This is where you control the nozzle and bed temperature, monitor your print progress, and get a preview of your model.
• Console: A command window for sending G-code directly. It's great for diagnostics or fine-tuning adjustments.
• Jobs: Your print history. From here you can reprint a previous job or manage your print queue.
• Configuration: The heart of Klipper. This is where the famous printer.cfg file lives. My advice: don't touch anything in here until you're comfortable with the basics.

I recommend focusing on the Dashboard first. From there you can preheat the printer, move the axes, push through some filament, and even adjust speed and flow on the fly. It's like having a remote control for your printer from the comfort of your couch.

Klipper's Secret Weapons for Next-Level Print Quality

Speed is great, but what truly makes Klipper stand out are two game-changing features: Input Shaping and Pressure Advance. They sound very technical, but their results are incredibly easy to see.

Input Shaping to Eliminate Ghosting

You know those ripples or "ghosts" that appear on the walls of your prints, especially around corners, when you print at high speeds? That's called ringing or ghosting. Well, Input Shaping is a technology that measures your printer's natural vibrations and cancels them out intelligently.

The result is that you can print at blazing speeds and still get smooth, flawless surfaces — as if you'd printed at a snail's pace. The Neptune 4 comes with pre-configured values that, honestly, work brilliantly straight out of the box.

Pressure Advance for Perfect Corners

Pressure Advance is another stroke of genius. It tackles a classic problem: at corners, the printer tends to over-extrude, leaving ugly blobs. Then as it accelerates out of the corner, it sometimes under-extrudes and leaves a small gap.

This feature anticipates those speed changes and proactively regulates filament pressure at the nozzle. What does that mean in practice? Clean, sharp, perfectly defined corners — even when the printer is running at full speed. For me, mastering these two features is what truly separates a good print from a spectacular one. And with the Elegoo Neptune 4, you have both tools available right from day one.

The Best Filaments and Profiles for Your Neptune 4

So you've got your Elegoo Neptune 4 assembled, calibrated, and you've started playing around with Klipper. Now comes the most important part: feeding it properly. Because let's be honest, there's no point having a high-performance machine if you're running it on low-grade fuel. A great printer deserves great materials!

I've been running a lot of tests, so I'm going to walk you through which filament types work best with this machine — and I'll share my starting profiles so you don't have to go in blind.

PLA and PLA+, the Everyday Workhorse

For 90% of projects — whether you're making quick prototypes or decorative figures — PLA and its upgraded cousin PLA+ are the undisputed kings. They're easy to print, produce minimal odor, and come in every color you can imagine.

The Neptune 4, with its seriously impressive cooling system, handles PLA beautifully — even at speeds that would have seemed impossible not long ago. Here are my starting settings for Cura or PrusaSlicer:

• Nozzle temperature: 210–220 °C. PLA+ sometimes benefits from a little extra heat.
• Bed temperature: 60 °C.
• Print speed: Start around 200–250 mm/s for perimeters and walls. For infill, you can push it up to 300 mm/s without any issues.
• Retraction: Thanks to the direct drive extruder, retractions are short and fast. Around 0.5 mm at 40 mm/s is usually enough to eliminate virtually any stringing.

With these settings, you'll be getting high-quality prints in record time — guaranteed.

PETG and TPU — technical filaments made accessible

This is where the Neptune 4's 300 °C hotend and direct drive extruder really shine. Materials that used to be a headache are now surprisingly easy to work with.

PETG is my go-to for functional parts that need solid mechanical strength and decent heat resistance. Think of it as PLA on steroids. Here's what works for me:

• Nozzle temperature: 235–245 °C.
• Bed temperature: 70–80 °C.
• Print speed: PETG is stickier and more demanding, so slow things down. Aim for 80–120 mm/s to ensure good layer adhesion and avoid common issues.
• Part cooling fan: Don't overdo it. Keep it at 30–50% — too much cooling can cause layer delamination.

TPU, the flexible filament of choice, is another material the Neptune 4 handles exceptionally well. The direct drive extruder's short, controlled filament path prevents jamming and feeding issues. In fact, part of the Neptune 4's popularity comes down to how well it manages these tricky materials. It's no coincidence that the Elegoo Neptune 4 series, with its 5.2:1 gear ratio extruder, has made such a strong impression in the market.

My TPU profile:

• Nozzle temperature: 220–230 °C.
• Bed temperature: 50–60 °C.
• Print speed: Patience is your best friend here. Start slow at around 30–40 mm/s, and if everything looks good, gradually work your way up.
• Retraction: Disable it entirely or use very low values (0.2 mm) to prevent clogs.

If you want to go deeper and truly master filament materials, check out my complete guide to choosing the right filament for your 3D printer, where I cover everything you need to know.

At the end of the day, it all comes down to experimenting. Every filament brand behaves differently, but with these starting profiles as your foundation, you've got everything you need to get the most out of your Elegoo Neptune 4. Now get printing!

Maintenance and troubleshooting common issues

Every machine, no matter how good it is, needs a little care to keep performing at its best — and the Elegoo Neptune 4 is no exception. Don't worry though, maintaining it is far simpler than deciphering flat-pack furniture instructions.

Here's my routine for keeping it running smoothly, plus a first aid guide for those days when things just don't go to plan.

My maintenance routine to prevent printing disasters

A few minutes of upkeep every now and then will keep your Neptune 4 printing like it did on day one. Trust me, a little prevention goes a long way!

• Cleaning the PEI bed: After every couple of prints, I wipe it down with a cloth and some isopropyl alcohol. This removes any fingerprint grease and makes sure that first layer sticks like glue.
• Belt tension check: Once a week, I do a quick check on the X and Y axis belt tension. They should feel like a guitar string — firm, but not over-tightened. Loose belts at high speeds will ruin your print quality.
• Axis lubrication: About once a month, I apply a little lithium grease to the Z-axis rods. This keeps movement smooth and quiet. And don't forget the POM wheels that run along the aluminium extrusion profiles!
• General cleaning: I try to keep the printer free from dust and stray filament bits. A quick blast of compressed air every so often works wonders.

Troubleshooting guide for everyday printing problems

We've all been there: a print fails and you're left staring at the machine with no idea why. Don't panic! I've put together this cheat sheet for the most common Elegoo Neptune 4 problems.

Problem 1: The dreaded clog

Every maker's nightmare. You notice the filament has stopped extruding, or it's coming out as a weak, thin trickle.

• Quick fix: Try a cold pull. Heat the nozzle to around 220°C, push a little filament through by hand, then drop the temperature down to 90°C. Once it gets there, pull the filament out with a quick, firm tug. This almost always pulls out whatever was causing the blockage.
• If that doesn't work: Time to roll up your sleeves and disassemble. Luckily, the Neptune 4 hotend is pretty easy to access. Remove the PTFE tube and use the included needle tool to clear the nozzle from below.

Problem 2: First layer won't stick

You hit print and instead of a clean first layer, you get a tangled mess of plastic spaghetti. A classic.

• Check your Z-Offset: I'd bet it's the culprit 99% of the time. Re-calibrate it using the paper test. Sometimes a tiny tweak of just 0.02 mm makes the difference between success and failure.
• Clean the bed: As mentioned above, a bit of isopropyl alcohol works every time. Fingerprint grease is invisible but it's the number one enemy of bed adhesion.
• Bump up the temperature: Try adding 5°C to both the bed and nozzle temperature. Sometimes that small boost is all the filament needs to bond properly to the surface.

This printer has been a massive hit, largely because of how reliable it is. Its 121-point automatic bed levelling system has been a game changer for a huge number of makers. You can find out more about its impact on the market here.

I always say it: a perfect first layer is half the print done. Bed leveling and a good Z-Offset are the foundation everything else is built on. Never underestimate them!

With these tips, you'll be covered for the vast majority of issues that might come up. And remember, the maker community is huge and there's always someone ready to lend a hand on a forum or Discord group.

When to Choose the Neptune 4 Plus or the Max

We've already covered everything the standard Elegoo Neptune 4 can do, and honestly, it's impressive. For the vast majority of us in this hobby, its 225x225x265 mm build volume is more than enough for almost any project. But what if your ideas don't fit in there? What if you want to print something truly… big?

That's where its bigger siblings come in: the Neptune 4 Plus and the true beast of the family, the Neptune 4 Max.

You're probably thinking: "Mr. Resin, do I really need that much space?" And my answer is always: it depends on how big your ideas are. If you're into cosplay and you're picturing yourself printing a Mandalorian helmet or a full chest plate in one piece — no splitting the model, no gluing sections together — then the answer is an absolute yes.

Comparing the Heavy Hitters

While all three share the same core DNA (Klipper, direct drive extruder, blistering print speeds…), the size differences are significant. And keep in mind, it's not just about making room in your workshop — a larger footprint brings other things to consider as well.

Here's a quick breakdown of the key specs:

As you can see, the jump to the Plus is already substantial, but the Max is in a league of its own. That build volume opens the door to projects that are simply out of reach for most FDM printers.

From experience, I can tell you that printing large-scale parts has a magic of its own — but it comes with its own set of challenges. Print times can stretch into multiple days, and getting a bed that size perfectly level becomes even more critical. Fortunately, the 121-point auto-calibration system continues to do a fantastic job.

Who Is the Neptune 4 Max For?

The Neptune 4 Max has earned a top spot in the large-scale modeling and prototyping space. Its massive 420x420x480 mm build volume and the ability to heat the nozzle up to 300°C have put it firmly on the radar of many professionals and ambitious makers.

In my opinion, this is the perfect machine for anyone looking to print real-scale objects or large prototypes without the hassle. You can check out all the official Neptune 4 family specs on the Elegoo website.

Bottom line: if your builds fit within the standard Neptune 4's print volume, look no further. But if your ambitions are bigger than its build plate, don't even hesitate — the Plus, or better yet, the Max, are the tools you need to bring them to life.

Final verdict: is the Elegoo Neptune 4 worth it?

Alright, makers, this is it — the moment of truth. After pushing this machine to its limits, running long prints and tackling some seriously tricky projects, it's time to give a straight answer. Is the Elegoo Neptune 4 really as good as everyone says?

I'll be completely honest with you: it's one of the best FDM printers you can buy right now for the money. Full stop. Elegoo has made a bold statement by including Klipper out of the box, putting high-speed printing within reach of anyone — no Linux expertise required, no weekends lost tweaking config files.

So, is this printer right for you?

The answer here is pretty straightforward: it's right for almost anyone who wants to get serious about 3D printing.

If you're just starting out and don't want to outgrow your printer in a few months, this is a solid buy. It gives you plenty of room to learn, experiment, and level up without feeling like you need something more powerful any time soon.

And if you're already an experienced maker looking for a machine that delivers consistent speed for your workshop without breaking the bank, this is a seriously impressive option. It's a reliable workhorse — fast, responsive, and dependable.

No printer is perfect — don't let anyone tell you otherwise. But I can confidently say that the Neptune 4's strengths are so compelling that any minor shortcomings you might find are barely worth mentioning. This is one of those purchases I'd recommend without a second thought.

FAQ: Your questions about the Neptune 4, answered

Alright, let's wrap things up. I've put together the questions I get asked most often about the Elegoo Neptune 4. No fluff — your time is valuable and your printers are ready to run.

What filaments can I use with the Neptune 4?

This is where things get exciting. Thanks to its direct drive extruder and a hotend that reaches 300 °C, this machine can handle just about anything you throw at it.

You can run the classics like PLA and PETG, step things up with ABS or ASA, or even tackle flexible materials like TPU that trip up lesser printers. It's a true all-rounder.

A word of advice: if you want to hit the ground running, grab a quality PLA+ filament. The results are impressive right from the first print and you'll avoid a lot of unnecessary headaches.

Is Klipper difficult to learn?

Not at all — don't let the name intimidate you! On the Elegoo Neptune 4, Klipper comes pre-installed and ready to go through Fluidd, a web-based interface that's genuinely easy to use. No programming manuals required.

With the tips I've shared throughout this guide, you'll have it mastered within a couple of evenings. Fair warning though: once you experience the smoothness and control it gives you, you'll never want to go back to Marlin.

Does it really print at 500 mm/s?

Yes, but with some caveats. Think of it like the speedometer on a race car: it can hit a crazy top speed, but you're not always flooring it.

That blazing 500 mm/s figure refers mainly to travel moves — when the print head is moving from one point to another without extruding any filament.

For quality prints, you'll typically run it around 250–300 mm/s, which — trust me — is still absolutely insane. You'll watch your print times get cut in half. It's a game changer.

Do I need to mod or upgrade the printer much?

Honestly, this is one of my favourite things about the Neptune 4: it comes out of the box more loaded than a Swiss Army knife.

The 121-point automatic bed levelling, direct drive extruder, and pre-installed Klipper are "extras" that would cost you serious money and a major headache to add yourself on other printers.

This machine is ready to go straight out of the box. I can recommend it without hesitation — it's a solid, capable tool that hits the ground running from day one.

Final Verdict:

Well makers, what a deep dive into the Elegoo Neptune 4! In my opinion, this machine has changed the game entirely, bringing high-speed printing within reach of anyone — no engineering degree required. Easy to use, powerful, and backed by a massive community. What more could you ask for? An absolute must-buy!

Now that you're armed with all this knowledge, it's your turn. Head over to the store, grab your favourite filaments, and let this beast loose!