Elegoo’s Saturn 4 Ultra 16K arrives like a quiet heavyweight into the 3D printer ring, and at an aggressive price ($649.99 list, discounted as low as $499 on Elegoo's own web store). This resin printer's underlying 16K mono LCD delivers an immediate jump in sharpness over its predecessor, and Elegoo’s signature tilt-style plate movement gives the machine a smooth, controlled rhythm that keeps large prints predictable. Elegoo also adds a small but long-requested quality-of-life upgrade: a resin-tray heater that keeps liquid at an ideal temperature, helping stabilize results in cooler workspaces.

Combined with faster print modes and a more polished interface, the Saturn 4 Ultra 16K feels less like an incremental refresh and more like a maturing platform. It still has a few rough edges, but for miniature-figure artists, prop builders, and anyone chasing an immaculate surface finish, the Saturn 4 Ultra sets a new quality bar for its class at print speeds up to 150mm an hour. It’s our latest Editors’ Choice pick for mainstream resin 3D printers.

Unboxing and Setup: Snugly Packed, Bursting With Extras

Elegoo ships the Saturn 4 Ultra 16K with the kind of protective overkill you appreciate in a resin machine. The printer arrives double-boxed in sturdy cardboard, with thick air-bladder cushions absorbing any impact from the outside world. Inside the chamber, dense custom-cut foam locks the vat and the build-plate lever firmly in place, preventing the slightest shift during transit.

(Credit: Michael Lydick)

It’s a reassuring presentation, suggesting that Elegoo has learned how to get a mid-size resin printer to your door without surprises. (My delivery guy is a nice enough but generally angry middle-aged man who considers it a personal challenge when a box says "FRAGILE." The Saturn survived his mobile crucible.)

Elegoo didn't skimp on the included toolkit, either. You get gloves, plastic and metal scrapers, and a full spare set of screws for future FEP replacements (that is, the film on the underside of the vat). Not to mention Allen keys for every serviceable part of the machine, a user guide, funnel filters for returning resin to the bottle, and a USB flash drive preloaded with the Elegoo SatelLite slicer and sample models. Elegoo even adds a few disposable face masks. They won’t meaningfully block fumes, but they're a considerate inclusion for newcomers setting up their first resin printer.

And let me just say it: When you take the machine out and set it up, it just looks cool. Elegoo is clearly leaning into a science-fiction aesthetic, with a stylized, futuristic feel. It's an elevated design that proves a tool doesn’t have to look like a tool.

(Credit: Michael Lydick)

Powering on the Saturn 4 Ultra 16K triggers a brief but confidence-boosting diagnostic routine. The printer runs through each major subsystem in sequence, checking the LCD panel, the LED array, the presence of the resin tank, the Z- and X-axis motors, the fans, the AI camera, and the mechanical sensor that monitors the vat’s tilt angle. As each component passes, a green checkmark appears on the screen. It’s a small touch, but seeing that row of green lights makes the startup feel deliberate and reassuring, especially before long or high-detail jobs.

(Credit: Michael Lydick)

Elegoo supplied its 8K Photopolymer Resin for testing, a general-purpose material tuned for high-resolution detail on modern monochrome resin printers. It's marketed as delivering crisp edges and curing predictably; I found that it has a moderate odor typical of standard resins. It’s not an engineering-grade formula, but it’s well-suited for showcasing the Saturn Ultra 16K’s imaging performance and behaves reliably in both standard and fast-print modes. Elegoo also sent its Tough Resin, but I wanted to use the 8K resin for the parts I’d be printing, since that's likely what most users will use.

(Credit: Michael Lydick)

I set about installing the included slicing software, SatelLite, from Elegoo's USB stick, as well as installing the 16K into my Chitubox slicing software. SatelLite, which Elegoo recently introduced, doesn’t yet have all the advanced features you’ll find in third-party slicers. But its simplicity and direct integration with Elegoo machines make it a practical choice for newcomers and experienced users alike. You’re given a choice between Light and Dark mode, so I kept it Light for comparison with Chitubox.

(Credit: Elegoo/PCMag)

Chitubox, meanwhile, immediately recognized the Saturn 4 Ultra 16K and even rendered the build plate’s auto-leveling posts accurately in its interface. I was able to send files wirelessly via both SatelLite and Chitu Manager to the unit’s built-in wireless receiver, making it easy to prep models in one room and print in another. Users who prefer not to network their machines, though, can still rely on the included USB key for fully offline transfers and greater control over IP security.

(Credit: Chitubox/PCMag)

When I loaded up the resin tray, I appreciated that it has both a MAX and a MIN line for filling; that's helpful for new users and veterans alike, since overfilling has particularly serious consequences here. The tilt tray is nice and works well, but it leaves a gap where dripping resin can fall into the machine's internals. Loading and unloading resin from the unit feels like taking your car keys out of your pocket while standing over a storm grate—anxiety-inducing, with you being extra careful not to drop them.

The included drip tray feels out of place. Thin and flimsy, it feels inexpensive next to the machine's overall build quality, and I wish I had something more reassuring in my hands when working with liquid resin. Still, two corner pour spouts in the resin tray make it easier and safer to pour out unused resin.

And the resin tray has a built-in heater this time—a game-changer if you’re putting the printer in a cold garage or shed far from your family and their lungs. You can easily activate pre-heating in the menu, which brings your resin to 30 degrees C, and watch as it moves the build plate up and down, mixing the resin as it warms. This ensures your resin is at the optimal temperature and consistent print to print. I used to mix my resin with a plastic spatula to reconstitute it, or pour it back into a bottle, mix it again, and shake it up. No more.

I love the integrated design and the lack of awkward external pumps and contraptions to heat the material. It’s a clean design that's seamlessly buried in the workflow.

(Credit: Michael Lydick)

To test the exposure settings for the 8K resin, I ran a few test prints and settled on near-perfect exposure times of 1.8 to 2.2 seconds. The Saturn 4 Ultra 16 features AI detection via the camera, which, in theory, lets you monitor the build plate as it works. In practice, though, the camera didn't detect anything on the plate until it was above the resin's surface, so there was nothing to see. Contrast that with the AnyCubic Photon M7 Max, whose integrated sensor can detect the amount of force applied to each layer. This unit has something of a detection blind spot.

Fortunately, during my testing, I didn’t have any issues with parts not sticking to the build plate, but I wonder if there’s room for sub-surface failed-print detection. I could hear the distinctive “tick-pop” every time the build plate separated from the FEP film. Maybe an integrated microphone to "listen" for resin peeling away, versus silence in the depths of the goo?

(Credit: Michael Lydick)

The prints stick so well in large part due to the surface of the build plate. It’s pretty impressive. In between each of the etched black lines are dozens of smaller micro-etched lines that give the plate a greater surface area to help your first layers adhere. No more scuffing build plates with sandpaper.

Real-World Use: Test Prints and Beyond

I can tell you that from this point in the testing, I had zero issues with the machine. Whatever I told it to print, it printed. No failed prints. No fishing around in the resin tray with a plastic spatula, peeling bad prints off the FEP film. The 16K just ran.

First up was the predictable Rook test print, which came out great at the 0.050mm layer setting on the slicer...

(Credit: Michael Lydick)

Next up: the Cones of Calibration. I’d see pretty quickly if the exposure tests I conducted earlier would hold up—and they did. None of the FAILURE cones were touching, and all of the SUCCESS cones were. Moreover, the sword easily popped out and fit in the interference grooves as well as the skull’s head. The go-no-go cylinder fit easily into the mug, and I felt pretty confident that the rest of the prints would work well afterward.

(Credit: Michael Lydick)

(Credit: Michael Lydick)

Next up was the AmeraLabs Town test print, which came out flawlessly. The edges were crisp and clear, and the thin posts reached up all the way to the top from the thickest to the thinnest of the matrix.

(Credit: Michael Lydick)

(Credit: Michael Lydick)

I moved on to the Siraya Tech test print and found it effortlessly captured all the details of the cube, with accurate measurements from the 0.15mm to the 2.0mm test blocks. I measured just under 10mm on the test strip (9.94mm) and observed no issues with the bridging in the far right corner, which was 4.96mm high (versus the 5.00mm expected).

(Credit: Michael Lydick)

Finally, it’s just not a test-print session without a Benchy. I think about the guy who first started printing this, and how we incorporate it into every test of every machine that crosses my desk. I wonder, someday, when they perfect Star Trek transporters, if the first thing they send through will be a Benchy...

(Credit: Michael Lydick)

The Print Technology: Escaping the Matrix

These kinds of outputs weren’t like the ones I'd seen a few years ago. It turns out, the technology has changed. The Saturn Ultra 16K uses a chip-on-board (COB) UV light engine with a Fresnel collimating lens, a clear step up from the older matrix-style LED arrays.

What does that mean? Traditional arrays rely on many small LEDs that create uneven brightness and softer detail at the edges. A modern COB module acts as one powerful, uniform light source, and the Fresnel lens straightens that light into parallel beams for sharper curing across the entire build plate. The result is cleaner exposure and more consistent performance, especially with a high-resolution 16K LCD.

(Credit: Elegoo)

Indeed, it makes a difference in the final objects. The Ultra 16K uses a 10-inch monochrome LCD with an ultra-high resolution of about 15,120 by 6,230 pixels, which works out to an XY pixel density roughly 14 by 19 microns on the build plane. That's a jump up from the 12K of the Saturn 4 Ultra. Between the numbers boost and the change in array technology, I saw the boost plainly in the printed output.

Further Printing Tests: Swinging for the Fences

Inspired by that, I wanted to test the 16K’s capacity at the smaller game-piece level, all the way up to a full-volume build print, and started with these 0.010mm-layer figures: a warrior and a dragon game piece. My son, who owns a Saturn 4 Ultra (12K), was visibly impressed with the results.

(Credit: Michael Lydick)

(Credit: Michael Lydick)

(Credit: Michael Lydick)

The supports on these models, which I generated in Chitubox on the Light setting, peeled away easily from the pieces, leaving very small dimples almost invisible to the eye. As I pulled, I wasn’t afraid of breaking away the more delicate parts of the game pieces.

At one point in the review, I was searching for a magnifying glass to look even deeper and closer at the smallest details, like the swords by the dragon’s foot and the skulls adorning the warrior’s armor. You start feeling like a kid making your own toys, and there’s a sense of wonder when you use this machine for these small pieces and show them to your family and friends.  

Next up was the Man of Steel, Superman himself, printed from the Chitubox slicer at a bottom exposure of 32 seconds and a layer exposure of 1.8 seconds. I wanted to see how the printer would handle the dimples in his costume and the details in his hair and face at a 0.050mm slicer layer height, and I was not disappointed.

(Credit: Michael Lydick)

(Credit: Michael Lydick)

It’s worth noting that, by now, I was wishing the Ultra 16K had a way to hang the build plate at an angle to allow the unused resin to drip back into the tray below. Because of how auto-leveling works on this model, via four spring-loaded posts, the top of the build plate is hidden somewhat, and little blobs of uncured resin quickly drip down if you’re not careful. (I wasn’t careful.) I searched online and easily found this angle hanger (in blue, below), which I printed in PLA on my Bambu Lab H2S...

(Credit: Michael Lydick)

It allowed the tray to hang down and the resin to flow away. I wish Elegoo included this as a test print for users to output when getting started.

I also had a comment from my wife, who passed by the room and noticed the faint resin smell. I hadn’t hooked up my air extractor to the cutout on the back of the 16K’s swiveling cover and lamented that the unit didn’t come standard with an activated carbon filter. That's something newer users won’t know they need if they are starting from scratch with this machine.

I set out to print a larger part, searching for a model with interlocking components to test the printer's accuracy and its ability to maintain consistent dimensions. I settled on Grogu from The Mandalorian and found that all the pieces glued together easily with Gorilla Super Glue. I don’t have an airbrush, but I can see how each of these parts could have been easily colorized before gluing. The 16K resolution easily captured the dimples in the sweater, the fingernails on the hands, and the smallest details in the butterfly landing on the extended hand.

(Credit: Michael Lydick)

(Credit: Michael Lydick)

In my next-to-last print, I wanted to test the full build volume of the cavernous 212mm-by-118mm-by-220mm space. I settled on the Xenomorph from the Alien movies, then chose Chitubox’s Medium support setting and turned it loose, at the 0.050mm slicer setting.

(Credit: Michael Lydick)

(Credit: Michael Lydick)

(Credit: Michael Lydick)

Bear in mind that I am normally an FDM guy. I found the Saturn 4 Ultra 16K's workflow very intuitive, and it was a matter of deciding how thin I wanted the layers (0.050mm, 0.025mm, or 0.010mm), which was usually determined by how long I wanted to wait for the print. Other than the dripping resin and the need to be careful with the tilt plate, I wasn’t really thinking very hard about the machine's process. The display UI and the software were very straightforward and simple for parts like this.

I then made my last print using Elegoo's SatelLite slicer, deciding to give my wife one more figurine for her collection to sit next to the Wonder Woman statuette I had made for her with the AnyCubic Photo M7. SatelLite was fairly straightforward and, in many ways, simpler than the somewhat imposing Chitubox slicer. I could employ a basic workflow, if I desired, and get straight to loading and printing my part. And at the 0.050mm slicer setting and 1.8-second exposure time, the Saturn 4 Ultra 16K yielded a perfect rendition of Batwoman...

(Credit: Michael Lydick)

(Credit: Michael Lydick)