ELEGOO Neptune 4 Max 3D Printer, 500mm/s Fast Printing, Support 300°C Printing, Auto Leveling and Direct Drive Extruder, 420x420x480mm Large Build Volume
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Size: Neptune 4 Max
Features
- LIGHTNING-FAST 500MM/S PRINTING: Powered by Klipper firmware, Neptune 4 Max reaches speeds up to 500mm/s (default 250mm/s) and 8000mm/s2 acceleration. Ideal for use with rapid filament in high-speed mode
- MASSIVE BUILD VOLUME: Spacious 16.53x16.53x18.89/420x420x480mm build area for large models or multiple smaller prints. For high-temp filaments or prints over 300x300mm, bed clips are highly recommended to prevent bed shifting
- PRECISION & QUALITY: Input shaping, pressure advance, and X/Y axis acceleration sensors ensure reduced vibration and enhanced printing accuracy for detailed, high-quality, fast prints
- DIRECT DRIVE EXTRUDER: Self-developed direct drive extruder with 5.2:1 reduction ratio provides powerful extrusion and smooth filament feeding, with a metal throat and optimized air duct to minimize nozzle clogging
- 300C HIGH-TEMP NOZZLE: The 60W ceramic heating element and extended hot end design ensure smooth extrusion for a wide range of filaments, including PLA, PETG, ABS, TPU, and nylon
- EFFICIENT COOLING & EASY OPERATION: Powerful double-sided cooling fans and model cooling blower fans prevent warping and improve print quality. Connect via WIFI, U-disk, or LAN, and start printing with one-click file transfer
Brand: ELEGOO
Material: Metal
Color: Black
Product Dimensions: 24.8"D x 25.9"W x 29.1"H
Item Weight: 18 Kilograms
Product Dimensions: 24.8 x 25.9 x 29.1 inches
Item Weight: 39.6 pounds
Item model number: Neptune FDM 3D Printer
Date First Available: May 31, 2024
Manufacturer: ELEGOO
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Top Amazon Reviews
Size: Neptune 4 Max
(Skip below to ger right into the review and some helpful tips) I have been using 3D printers for quite some time now. My first unit being an ender 3 v2 right after it released. My next was a CR-10 clone made by SUNLU called the S8. Even with the S8 being a CR-10 clone it was still considerably easier to set up then this Neptune 4 Max and the Ender 3 was miles easier then the Neptune 4 Max. But what I have learned is as the bed size gets larger the setup becomes more complex. I used my Sunlu S8 for many years. Unfortunately it was becoming long in the tooth. It was a bowden extruder for one, completely manual leveling and was marlin. Parts were starting to wear out on it. I was considering bringing it up to modern standards but that would have gotten me halfway to the price of a new printer and I would still be left with a knock off CR-10. Doing my research brought me to this printer. On paper it has everything you would want. Excellent build quality, filament run out sensor, Wi-Fi-Ethernet, Klipper, a nice build plate, auto leveling with the ability to manually level to hone things in, a really nice touch screen and lastly a huge build volume. With all of this awesomeness comes some serious challenges though at least for me anyways. (REVIEW) Now I'm not here to tell you I'm the world's most knowledgeable at 3D printing. Infact I'm just constantly learning. Being that my CR-10 clone was so old and that it was still on marlin the user interface is completely different and a little more complex. I also had to swap over to Orca slicer as well. Apparently the world has moved on from Cura and I have been stuck in the past. All of these things work well but also come with a learning curve. If this is your first printer be prepared to spend days just learning before you get your first clean print. Even after all these years of 3D printing it took me a good six days to get a clean print. (SETUP) This is where things get a little complex with this guy. Actually putting it together only takes about an hour. But calibration takes much, much longer. None of my belts came tightened to the right degree so I gave them a bit of a tightening by hand which is easy enough with both of the belt knobs. I honed them in during prints to get them spot on. The real hastle here is bed leveling! Bed leveling on this machine is far harder then any machine I have ever had. This is probably down to my own skills. To be honest on my other machines I would just manually level it until it was close enough and use some glue stick to make my prints stick. Close enough doesn't work on this machine. You are going to have to be within spitting distance of perfect. First thing I did was swapped out the included springs with silicone springs. The standard springs are fine at first but they always wear out quickly leading to having to constantly level the printer. The silicone springs should mean that once I get it leveled it should last for a very long time plus they won't wear out. Then you must and I do mean MUST let the bed heat up and the nozzle heat up for a full half an hour. This gives everything time to expand to where it's going to be while printing. I'll tell your right now if you skip this step you will have problems with adhesion. Then I did a manual level first. I tried the old paper method but I was having terrible luck. So I went out and purchased a set of feeler gauges. For me the feeler gauge is almost a necessity for this thing (again that may be a skill issue on my part). Using the feeler gauge and getting a small amount of resistance between the bed and the nozzle got this thing really level. I had to go around the whole bed probably two or three times slightly adjusting each leveling wheel until it was perfect. At that point I went into the advanced settings and turned on Professional mode for the auto bed leveling. This gives the machine over 100 points while automatically leveling instead of just over 30. This made a huge difference for me. At this point it was time to let it auto level. That process takes right around ten minutes. After it's done it prompts you to adjust your Z Height Offset. You have got to get this at least in the neighborhood of right in order for your prints to stick. It doesn't have to be perfect, you can hone it in on the fly while printing. I just used the 0.1 option to make the nozzle touch the bed and then used the 0.01 option until I could get my feeler gauge under the nozzle and get a small amount of resistance, and by small I mean small. You just want to feel that nozzle dragging across the feeler gauge as you pull it out. At this point I removed the magnetic build plate and washed it in the sink with dish soap to remove any oils from the factory or my hands. It seems like overkill I know but this build plate doesn't seem to want to work as good unless it's really clean. At this point I sliced some test prints. I watched as it laid the first layer down and slowly honed in my Z height until I could see the filament was making nice fat lines on the build plate. I would use my finger nail on the exposed areas of the print to gently rub across the print to see how it was sticking. After getting my Z height just right I was really happy with how prints stick to the build plate on this. At least for PLA no glue or hairspray is needed once you have this leveled right. I did a large print that took about 30 hours and did notice I was definitely getting some layer shifts happening. After some investigation I realized my belts were still a bit loose, tightening these fixed that issue all together. I also had to work with my fan speeds, printing temp, print speed and extrusion amounts because none we're set right in Orca Slicer or the machine at least for the filament that I was using. Also, this machine can print fast, very fast infact but I was having terrible results above 70% of full speed. I can't see getting good results at 100% unless the geometry of the print is very simple or you have skills that I just don't have. For me printing at 210 degrees with the fan at 30% on silent mode at 70% speed gave me the best results so far. That is probably going to be different for everyone though. After that point my prints were very clean! The filament sensor also worked really great for me. My old CR-10 clone also has a filament run out sensor but it always left a small gap when it would resume after changing filament. That didn't happen with this, to my eyes it looked like the print had never stopped at all. The biggest game changer for me with this printer is the fact that it has WiFi built right into it. All you need to do is go into settings, connect as you would on any device and then take note of your printers IP address. You can put that IP into Orca Slicer and then you'll be able to send prints from Orca directly to your printer! No SD card, no thumb drive. This was amazing to me and it works really well! Lastly, I want to just talk about the printer itself. First your going to want to make sure you have a space big enough for this absolute monstrosity of a printer. This thing is massive. It is probably twice the size of my CR-10 clone. It takes a lot of space but you can pretty much print anything you can imagine. Probably even a toilet seat if you wanted to. It is also by far the best built 3D printer I have ever had. The fit and finish here is amazing. It even has a little drawer for your tools if you have the max model. (Conclusions) So far I am really enjoying this printer. Some say this isn't a good model to pick for beginners. Infact I have heard many people say that no large format printer is good for beginners. I disagree with this just be prepared for a large learning curve, some failed prints, hours of YouTube tutorials and lots and lots of calibration. But even if you're a beginner don't write this printer or printer line off. Don't let the negativitie reviews scare you either. That said this is a very difficult printer to get going. At least it was for me! I think some of this comes down to the size of the bed and some of it comes down to my skills. This thing prints very well once you do get it going though but it's not an out of the box experience. No printer is but this one was less so for me. That being said once it is set-up you'll be good to go for a long time and will just have to make small adjustment once it does need leveled again. It has been my experience for most negative reviews of 3D printers that I have read it was simply the case that the printer just wasn't set up correctly. I think that is the case with this printer as well. If your willing to take on the challenge of getting this thing going then I think you won't be let down!
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Reviewed in the United States on March 7, 2026 Reviewed in the United States on March 7, 2026 by masa1607
Size: Neptune 4 Max
Ran good for several months, started having problems with the extrudes. Extruder gear was plastic and worn completely out. After a week of disassembling, it several times at Elegoos technical supports request i gave up and ordered a spare extruder assembly and hot end. The wrong one came. So, i have reordered the correct one and hope to get it soon. each order takes a week to get here, and the tracking is almost nonexistent. They finally said they said they would send an extruder gear set; the picture looks like they might be metal. Ill find out when they get here in a week or so. I ordered a metal upgrade set but don't know if i should put them in before i see is Elegoo's solution works. I have ordered 3 Elegoo printers since December 19th - a Neptune 4 MAX (the problem child) and 2 carbon 2's. I'm starting to worry that this is a HUGE mistake. The printers have been great up to this point but if tech support is going to be like this i might be on my own. I ordered Parts from Elegoo to repair this printer on my own as Elegoo told me warrantee parts would have to come from China and would take 11 or more days to get here. I ordered a hot end and extruder from elegoo, and got the wrong one, (My fault) so i reordered the correct one. and it took time to get a return authorization for the incorrect ones. When they received the refund for the extruder - they didn't credit me for the hotend. whether the lost the hotend or just refused to credit me for it They didn't explain. Slow and painful customer support. Common parts for customer support unavailable without shipping from China is frustrating. I like the printer and I fixed it on my own with parts from amazon, but waiting for the replacement parts for weeks and the frustration over the return will have me looking at another brand and possibly returning the printers that Are still within the return window. I am a retired Machine repair technician with a computer electronics degree and 30 years of experience. So I'm familiar with repairing computers and industrial machines.
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Reviewed in the United States on March 9, 2026 by Rodney B May
Size: Neptune 4 Max
It has its quirks and headaches but this is a great printer than has a lot of upgradability to it. Bed leveling, yes there is auto setup but please do it manually, bed leveling issues can be minimized by installing silicone bushings in leu of the stock springs(I used 16mm bushings from 3Dman). I made a cable track for the extruder/hotend ribbon cable because the woven fabric could get damaged by the z axis lead screws touching the slack of the cable. I personally wouldn't recommend this as a first 3D printer if you're not up for a troubleshooting challenge, but, for the price and the prints this thing is capable of, it's great. Once I got my printer up to spec the print quality is very very consistent. Oh and please! Spend the extra couple of bucks for a quality USB drive. Or else you'll start a massive print only to find out the USB wiggled itself loose and the print stops. Wifi can be iffy but I run a lan connection via laptop. Oh and this printer is quite large, hence the 420mm×420mm×480mm bed plate.
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Reviewed in the United States on June 1, 2025 by steven reed
Size: Neptune 4 Max
I bought the Neptune 4 Max and it is very large. The opportunities are almost endless for such a large printer with one insane flaw, the first layer. I have to fine tune the z-offset 3 to 4 times to get a print to stick. I'll follow the instructions perfectly, set the z-offset, start the print and it doesn't stick. So, I'll double check the z-offset and the number is the same as I just set but it is no longer snug on the paper. This machine usually ranges from -2.19 to -2.40 and it varies each time the machine homes. If you get lucky and it actually works, you'll get a decent print, otherwise it'll pull the print off the bed as it passes by and you have to start over. Having said that, it makes my Creality K1C seem like dream to get the first layer down. If you go through the manual leveling, then the professional auto leveling, there is a 20% chance you are going to have success. For the price, it's an okay value. Filament isn't cheap and you'll waste a lot with failed first layers but all that aside, I did get some pretty amazing prints. I also have Bambu and Creality machines so keep that in mind with my review. This machine is obviously not the same tier but it should work better than it does. It's also worth nothing the nozzle heat time is insanely fast compared to other brands which make sit nice swapping filaments out for multicolor prints.
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Reviewed in the United States on July 28, 2025 by Barry Lee Graham
Size: Neptune 4 Max
This is my second 3D printer after my flashforge which i have been using for many years. I mainly bought this printer for its size. I must say, its overall a nice machine except two important areas: nozzle construction is absolutely mediocre at best! The thing falls apart so easily even if you are trying to change the nozzle itself!! Thermometer and heater are held together barely by a very flimsy metal clip. I also removed the big fan since i had two print failures that caused a death blob. First time i thought i had adhesion issue so the second time i properly leveled the bed and watch the first layer go down then to my surprise failure happened again!! The issue with this printer is if the print fails it seems that Z axis does not advances ( FW bug?) and it keeps depositing print material until it pushes up the head and entangling all the delicate wires. I currently tried to activate Z hop to see if i can get a stable print. So far it seems to be working. Only buy this machine if you need a large volume and are ok with time to time failures. Good thing is parts are super cheap, but don’t expect plug and play. Printing on this machine is a little bit of art and labour of love lol To the design team at elegoo! Please release a proper hotend design with integrated thermoster and connectorized solution. It is absolutely not acceptable the way it is right now! This is not a $500 machine. I think you should send updated redesigned hot end to all the customers for free. The rest is ok! Also fix the root cause for Z axis not advancing i am sure you know about this issue. I must say, i bought this machine new, updated to all FW and leveled both auto and auxiliary and also use blue tape on bed for better adhesion and added zhop! So if that’s not enough tell me what is!?
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Reviewed in the United States on December 20, 2025 Reviewed in the United States on December 20, 2025 by sasan
Size: Neptune 4 Max
My other printer is a BambuLab X1C. This printer is no where near as refined nor pub and play as the Bambu X1C is. On the other hand, this printer is a third the cost, and prints twice the volume. I bought it specifically for some parts I designed that were just a little too large for the X1C. Thus far, the print quality is a bit less than what I've come to expect from the X1C, but I've been using this printer without an enclosure, and I still have some tweaking to do with the settings. Assembling it, I found the instructions a bit confusing at times, but the video is quite helpful. One reservation buying it on Amazon: after purchasing it here, I found that Elegoo offers it on their site for about $100 less. UGH!
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Reviewed in the United States on December 11, 2024 by Andrew S.
Size: Neptune 4 Max
Terrible experience. If this is your first attempt to get into 3D printing do not waste your money on this printer. I have had mine for 6 weeks and have only managed 2 semi successful prints. The bed DOES NOT stay level. The extrude does not extrude at the correct flow and rate. The Elegoo brand filament DOES NOT adhere to the print bed. After hours and hours of research to find the correct adjustments for the bed level, Z off set, Z hop, bed temperature, extruder temperature the most that prints from this horrid machine is blobs and worm blobs. I have watched upward of 20-25 YouTube tutorials and walk through, I have re watched and re watched the set up videos to ensure that the thing was set up correctly. Nothing works to get this horrid machine to function as advertised. If you are looking for a 3 D printer to get into the hobby do no purchase anything in the Neptune fleet from Elegoo. Their support center asks for high definition video and pictures of the failures and offers nothing more until you provide HIGH DEFINITION VIDEO. Look at the Creality brand of 3D filament printer. They at least seem to sell a working printer. Elegoo just pumped a bunch of crap onto the market to try and compete and released a woefully terrible printer and experience. Dang near spoiled me on the entire hobby.
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Reviewed in the United States on April 3, 2025 Reviewed in the United States on April 3, 2025 by Amazon Customer
Size: Neptune 4 Max
So far so happy! I carefully assembled the printer, but when I turned it on, the screen didn't light up. I immediately thought there was a problem and contacted technical support. However, I had connected the screen to the internet portal, which happens to be the same type. Since I don't use cable internet, I didn't realize the error at the time. After a long wait for nothing, I'm finally printing for the first time, a temperature tower, to continue adjusting this printer, which, from what I can see, requires periodic maintenance, but it's an excellent printer.
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Reviewed in the United States on October 8, 2025 Reviewed in the United States on October 8, 2025 by Fred