The Saturn 4 Ultra delivers, with fast and crispy 12k prints using ordinary resin and the same PFA films we’ve seen on Saturn’s for years. The improvements are within the machine itself – it has auto leveling with built-in sensors, a print monitoring camera that can also shoot time lapses, and a vat that gently peels each layer off the film by tilting.

The vat isn’t the only thing that tilts, so does the hood. The hood – which protects the uncured resin from ambient UV exposure – is on a hinge that can be tilted back with one hand. No more grabbing the lid with two hands and trying to find a place to set it down. This may seem like a small detail, but it’s a huge help, especially when you have limited work space. 

Specifications: Elegoo Saturn 4 Ultra review Jordan

Included in the Box: Elegoo Saturn 4 Ultra 

 

The Elegoo Saturn 4 Ultra includes everything you need to get started as soon as you unbox the printer. You get a metal scraper for the build plate, a plastic scraper for the release film, paper funnels, disposable gloves, disposable masks, a set of Allen keys, a power cord with adapter and a printed manual. It also comes with a cheap plastic drip tray.

Also in the box is a USB thumb drive preloaded with Chitubox slicing software, a PDF of the manual and presliced test prints.

Printing Safety with Elegoo Saturn 4 Ultra

 

The Elegoo Saturn 4 Ultra requires the same safety precautions as other resin printers. Uncured resin is dangerous, and the solvents used to clean your prints can be irritating to the skin. Use gloves and safety glasses when pouring resin and handling uncured prints.

Assembling the Elegoo Saturn 4 Ultra

 

The printer comes fully assembled. You only need to remove the packing materials, and you’re good to go.

Calibrating the Build Plate on the Elegoo Saturn 4 Ultra

Unlike other resin printers, the Saturn 4 Ultra doesn’t require manual calibration. It has a mechanical sensor that detects how well the plate and glass are fitting together and can adjust accordingly.

Design of the Elegoo Saturn 4 Ultra

 

The Saturn 4 Ultra is a mid-sized resin printer with a very modern feel. It has an all-black shell with Elegoo’s stripe pattern on the hood, and futuristic angles built into the design. The screen is off centered, and set up portrait style. All the buttons and ports are on the right-hand size, which is nice as this printer is a good 30 pounds and not something you want to spin around to find the off switch.

The most noticeable difference is the hinged UV hood

. Most printers are still using a lift-off box type hood, which is unhandy at best – and also requires having a good chunk of empty counter space nearby. This hood swings upward with one hand. It’s a huge improvement, but I’d still like to see a handle on the lid. I’m often opening or closing the lid after handling uncured resin, which can leave ugly smudges on your machine if you fail to clean them in time.

Elegoo Saturn 4 Ultra review Jordan

It’s a “smart” printer with several auto features to assist you. When you turn it on, it will run through a checklist to make sure all the components are working. It has sensors to make sure you have enough resin, and it can also tell if bits of a failed model are still stuck to the vat to prevent damage.

 

The AI camera is a mixed bag – it can detect an empty plate, but only once the plate is above the vat, which is around 50mm. Likewise, it can’t create time lapses on anything shorter than 50mm. It has “warp detection” but it has to be very obvious – no alarm was sounded on the print below which started to peel off the bed.

 

The camera is very handy for monitoring your prints, but it needs Chitu Manager switched on for it to work, which is not explained in the directions.

The printer also auto levels itself, so there’s no fumbling around with a piece of paper and a hex key. We’ve long had auto leveling on the FDM side of 3D printing, it’s wonderful to see this feature in resin.

The Saturn 4 Ultra has 12K resolution (11,520 x 5120) on a 10.1-inch monochrome LCD screen. This overwhelming number of pixels achieves a 19 micron accuracy on the X axis, which is incredibly crisp, especially when you consider that a human hair averages 70 microns. We’ve reached a point of resolution where layer lines simply disappear.

The build plate on the is laser-etched

which holds prints well while still being fairly easy to scrape off. The top of the plate isn’t quite sloped enough to get all the resin back into the vat, and the large block between the plate and the latch makes cleaning it unhandy. On the plus side, the machine comes with a drip tray you can wrap around the vat to contain resin droplets, and the vat has an excellent no-drip pour spout for getting resin back into the bottle.

 

A scratch resistant screen protector is taped over the LED glass at the factory.

The touch screen is similar to other Elegoo resin printers and is well thought out and easy to use.

Slicers Compatible with the Elegoo Saturn 4 Ultra

 

The Elegoo Saturn 4 Ultra ships with a free copy of ChituBox Basic, which does everything you need. It handles supports automatically, has tools for hollowing the model and adding a drainage hole so you can conserve resin.

The Saturn 4 Ultra is not yet supported by LycheeSlicer.

Washing and Curing Your Prints

 

Before you can admire your prints, you’ll need to wash them with Isopropyl alcohol and cure with UV light. I like to give prints a 30-second hand rinse in a container of 95% Isopropyl alcohol, then a 2-minute rinse in the Elegoo Wash and Cure station, 

Completely dry the print with a hair dryer on cool – IPA left on the print will turn white. You can also let the print air dry in a place away from sunlight.

Supports are easier to remove before curing because they are softer. Clip the supports off with side cutters and use tweezers to remove stubborn supports. Remember to always wear gloves while handling uncured prints.

Then place the print in a UV curing station for a few minutes, or outside in bright sunlight for a few hours.

Your IPA should never be flushed down the drain, especially after being contaminated with uncured resin. Instead, keep using the resin until it’s too dirty, then leave the container open to evaporate. The remaining sludge can be cured with UV light or the sun before being thrown away.

Supports should also be cured before being thrown away.

Sample Prints on the Elegoo Saturn 4 Ultra

 

I’ve been using the same model – Wekster’s Rocket – when I test resin printers, so I have something consistent to compare. This was printed in Elegoo 8K Standard resin using the default Chitubox settings, a .05 mm layer height, and a 3.5 second layer exposure time. This print took 3 hours and 13 minutes, which is pretty average. The results are excellent, with clean and clear details around the teeth on Rocket and the vines on Baby Groot. 

For comparison, this same model was printed in one hour and 31 minutes on the Anycubic M5s, a true high speed printer, using similar resin.

 

I loaded the Saturn 4 Ultra with Phrozen’s Aqua Grey 8K to see how it would do with a different brand of resin, and I was happy to see the Saturn had no trouble at all. This D&D miniatures printed very clean with beautiful details. These printed in 2 hours and 12 minutes using a 3.5 exposure time and a .05 mm layer height.

 

I’ll admit that I’ve been printing a lot of dragons lately, so I was curious how a Cinderwing dragon would do in resin with the Saturn 4 Ultra. I picked the Rose dragon, which has extremely delicate flower petals all around the body – which the Saturn printed without any issue. I didn’t bother hollowing it, and I also printed it flat on the plate without supports. It came off the bed with just a little bit of chisel persuasion. This is printed with Inland’s budget priced Standard bright red resin. I didn’t have to make any adjustments to the print settings, and it printed with a .05 layer height, using a 3.5 exposure time in one hour and 21 minutes. 

For comparison, a Bambu Lab P1P on its finest setting and using 99 walls to achieve a similar thickness, would take 12 hours and 42 minutes to print this same model. 

Bottom Line

Conclusion:

The Elegoo Saturn 4 Ultra is an exceptional resin 3D printer that offers outstanding print quality, innovative features, and ease of use. Its high resolution, auto-leveling, tilting vat, and camera make it a great choice for both beginners and experienced users. With its suitability for dental applications, the Saturn 4 Ultra is a valuable tool for dental professionals seeking precise and detailed 3D prints.