Elegoo Mars 5 Ultra vs Saturn 4 Ultra: Which One to Choose Based on Your Print Size

What's the core difference between the Mars 5 Ultra and Saturn 4 Ultra?

The main difference is build volume, not print quality. Both share the same tilt-release mechanism, auto-leveling, AI camera, and print speeds up to 150 mm/h. The Mars 5 Ultra is a compact 7" machine with a smaller build plate, while the Saturn 4 Ultra features a 10" screen and a much larger build volume for big parts or batch printing.

Strip away the size factor and these two printers are essentially the same machine in different bodies. Both use a tank-tilt mechanism to release each layer, both auto-level at startup, and both include a camera with print failure detection. In fact, the Elegoo Mars 5 Ultra is one of the few printers in the Mars lineup to include that AI camera — a feature that used to be reserved for top-of-the-line models.

And I'm not alone in seeing it this way: the Elegoo Saturn 4 Ultra is, at its core, a Mars 5 Ultra that's been supersized. The Elegoo 3D printers in the Ultra lineup share the same architecture, so the real decision comes down to one question: how large are the parts you need to print?

What are the build volumes, and what is each printer best suited for?

The Mars 5 Ultra offers 153.36 × 77.76 × 165 mm, making it ideal for miniatures, jewelry, and small parts. The Saturn 4 Ultra steps up to 218.88 × 122.88 × 220 mm — enough for sectioned cosplay helmets, full-scale prototypes, or printing multiple miniatures in a single run. The Saturn's build plate is nearly triple the surface area of the Mars.

The Mars 5 Ultra's build volume is identical to its predecessor, the Mars 4 Ultra, keeping it in the compact format the Mars series has always been known for. It's a volume built for fine detail work: you can fit several miniatures in a single print run or a mid-sized prototype without any issues.

The Saturn is a different story when it comes to size. At 218.88 × 122.88 × 220 mm, it lets you print full-scale prototypes without splitting the model into multiple pieces — something you'll be forced to do on the Mars the moment any dimension exceeds around 150 mm. For batch production, the difference is massive: the larger build plate means far more parts curing at once in a single run.

• Mars 5 Ultra: 28–75 mm miniatures, jewelry, small prototypes, ornaments.
• Saturn 4 Ultra: sectioned cosplay builds, large busts, miniature batch runs, industrial prototypes.

One note on Z height: the Saturn 4 Ultra tops out at 220 mm, but if you need more than that, the Saturn 3 Ultra with its 260 mm of vertical travel might actually serve you better. Don't assume the newer model wins across the board.

It's happened to me — I had a model 240 mm tall and realized too late that the Saturn 4 Ultra fell just four millimeters short. Always check the Z height before you buy. Spec sheets don't lie, but they're easy to overlook.

Which Has Better Pixel Resolution?

The Mars 5 Ultra wins on pixel density, offering 18 × 18 μm on a 7" 9K screen. The Saturn 4 Ultra uses a 12K panel on 10" with 19 × 24 μm pixels. On paper, the Mars resolves finer detail per pixel — especially on the Y axis — but at miniature scale the difference is virtually invisible to the naked eye.

Here's the catch with "K numbers." The Saturn has a higher total pixel count (12K vs. 9K) because its screen is larger — but that doesn't mean smaller pixels. The 9K figure refers to total pixel count, not pixels per inch; what actually matters is the 18 × 18 μm XY resolution. To put that in perspective, both printers produce pixels finer than a human hair. At that scale, arguing over a few microns is splitting hairs.

The Saturn comes in at 19 microns on the X axis, where layer lines are thin enough that you have to look for them deliberately. The practical takeaway is that both printers have crossed the threshold where the human eye can resolve further detail — the Mars wins on pixel density, the Saturn wins on build plate area. To dial in exposure settings on either machine, it's worth having an Elegoo resin settings guide on hand, because final sharpness depends just as much on cure time as it does on pixel size.

Which Is Faster in Real-World Prints?

Both printers advertise up to 150 mm/h thanks to tilt release, so layer speed is essentially equal. In real-world use, the Saturn 4 Ultra delivers more volume per hour because its larger build plate lets you print more parts per run. The 150 mm/h peak speed is a marketing figure — in normal use with fine detail, you'll print considerably slower.

The 150 mm/h figure Elegoo advertises is the theoretical ceiling in fast mode using default slicer settings. Hitting that 5.5-second-per-layer pace requires fast mode with ChituBox default settings and a 2.5-second exposure time. The moment you increase exposure for a denser resin or a detail-heavy model, that number drops.

The real speed leap over previous generations comes from the tilt release mechanism. Tilt release peels each layer with far less force than the old lift-and-drop method, and that's what delivers both the speed gains and fewer failed layers. On the Mars, this same system made it possible to switch from expensive ACF film to standard PFA film without sacrificing speed. Where the Saturn pulls ahead is throughput: printing forty miniatures at once on a large build plate will always outperform running multiple smaller batches on a Mars.

Which Resins Work Best in Each Printer?

Both printers accept any 405nm UV resin from any brand — no proprietary consumables required. Standard, water-washable, ABS-like, and high-speed resins all work fine. The Mars 5 Ultra shines with high-detail miniature resins; the Saturn benefits from resins with good flow on its larger build plate, especially in cold environments.

One of the standout advantages of the Ultra series is that it doesn't lock you into expensive proprietary resins. You can use any 405 nm resin, including the full range of compatible Elegoo resins as well as third-party brands. The AI camera, by the way, detects failures based on geometry rather than resin type, so it works equally well with any material.

There's one important temperature consideration. The standard Saturn 4 Ultra 12K does not include a built-in tank heater — a limitation that can cause adhesion failures in cold workspaces. It's the 16K version that introduces a heater to keep resin at 30 °C. If you print in an unheated space or work with technical resins, factor this in before you decide. For miniatures and standard hobby printing in a temperate indoor environment, neither version requires extra heating.

When do you NOT need the Saturn 4 Ultra's extra build volume?

You don't need the Saturn if you print 28–32 mm miniatures, jewelry, small prototypes, or parts that fit within a 15 cm build plate. For that kind of work, the Mars 5 Ultra delivers the same surface quality, takes up less desk space, costs significantly less, and features the identical AI camera and auto-leveling system. The Saturn's extra volume only pays off if you're actually going to fill it.

The Mars 5 Ultra is a genuine competitor to the Saturn when it comes to surface quality at small scale: the Saturn wins on build volume, the Mars wins on detail density. If your day-to-day work is tabletop RPG figures, small busts, or functional parts that fit in your hand, paying twice the price for a build plate you'll leave half empty simply doesn't make sense.

That argument collapses the moment you need size. A cosplay helmet, a large one-piece housing prototype, or batch-printing dozens of minis per run — those call for the Saturn. But if you're never going to print anything taller than 165 mm or need to run large batches, the Mars more than covers your use case, and for a lot less money.

Side-by-side comparison table with full specs

For additional reference, there is a Saturn 4 Ultra 16K variant that improves XY resolution to 14 × 19 μm and adds a vat heater that keeps resin at 30 °C, with a build volume of 211.68 × 118.37 × 220 mm. This is the model to consider if you need maximum detail or print in a cold environment.

My recommendation based on your project type

I'll give you a straight answer. For makers who paint miniatures, create jewelry, or prototype small parts, the Mars 5 Ultra is the smart buy: the same pixel quality where it counts, the same AI camera, the same auto-leveling — all at €269, which puts the Saturn well out of reach. Paying the Saturn's premium just to leave half the build plate empty is money down the drain.

That said, if your work demands size — cosplay pieces printed in sections, large single-piece prototypes, or batch-printing minis to sell — the Saturn 4 Ultra isn't a luxury, it's the right tool for the job. The larger build plate pays for itself within weeks if you print seriously. And if you're torn between the Saturn 12K and 16K, the question isn't about detail (at miniature scale you won't see the difference): it's whether you print in a cold workshop, in which case the 16K's vat heater will save you from adhesion failures.

It really comes down to this: the Mars 5 Ultra for fine detail and tighter budgets; the Saturn 4 Ultra when your prints don't fit in your fist or you're printing to sell. Choose based on the size of your models — because in every other way, these two are equals.

Enjoy the process 😎

ELEGOO Mars 5 Ultra

If your projects demand small parts with an exceptionally high level of detail, the Mars 5 Ultra is the perfect fit for that kind of work. It prints fast and captures textures that other machines in its price range simply can't reproduce with the same precision.

€269.00 View in store →