Elegoo Saturn 4 Ultra Review: A Resilient Leap in Resin Printing

Let’s dive straight into the Elegoo Saturn 4 Ultra, a resin printer that has been refined with real customer feedback rather than just chasing higher resolution.

It stands out as the easiest resin 3D printer I’ve ever used—plug‑and‑play, minimal setup, and no fiddling with calibration settings. This review covers its features, specifications, unboxing, assembly, leveling, print quality, benefits, and shortcomings.

Key Features of the Saturn 4 Ultra

• Tilting Resin Vat Technology for faster peel cycles
• One‑Click Auto‑Leveling with self‑checks
• Real‑Time Monitoring & Timelapse capture
• AI‑Enabled Camera with failure detection
• 12K Mono LCD (10‑inch) – 11,520 × 5,120 pixels
• Smart Mechanical & Resin Volume Sensors
• Integrated Resin Heat Detection
• Dual High‑/Low‑Speed Printing Modes
• Wi‑Fi Connectivity for firmware & AI updates
• Quick‑Release Build Plate
• Resin Vat Pouring Spouts
• Capacitive Touchscreen UI
• COB + Fresnel Collimating Lens (405 nm)
• PFA Release Film
• Plastic Resin Drip Tray Attachment

Tilting Resin Vat Technology

The Saturn 4 Ultra’s tilting vat delivers up to 150 mm/h print speeds by rotating the resin tank during the peel phase, dramatically reducing post‑print handling time while preserving a 1‑in‑inch‑wide vat capacity identical to the Saturn 3.

One‑Click Auto‑Leveling & Self‑Checks

Upon powering on, the printer performs a comprehensive self‑diagnosis—checking LCD, motor status, LED, fan, temperature, and mechanical sensors—before automatically leveling the build plate, even with resin present. This feature eliminates repetitive manual adjustments and ensures consistent print quality.

Real‑Time Monitoring & Timelapse

With a high‑definition AI camera, you can watch your print in real time and capture a timelapse directly via the ChituBox app’s ChituManager module. The app also stores a history of completed prints and provides downloadable timelapse videos.

AI Camera with Intelligent Failure Detection

The camera alerts you to common issues such as an empty build plate or model warping. While it doesn’t catch every anomaly—an occasional gap was observed—the system’s updates over Wi‑Fi promise ongoing improvements, similar to features found on BambuLab machines.

12K Mono LCD (10‑inch)

Retaining the 12K resolution (19 × 24 µm XY), the display delivers sharp detail and precise layer alignment. Although the resolution is unchanged from previous models, it remains competitive for high‑fidelity prints.

Smart Mechanical & Resin Volume Sensors

The resin volume sensor warns you when the tank runs low, preventing accidental starts on an empty vat. A mechanical sensor detects residue build‑up, protecting the LCD from damage and triggering alerts for resin shortage or leveling failures.

Resin Heat Detection System

A built‑in temperature probe monitors resin temperature, ensuring it stays above the optimal 20 °C threshold. The printer’s integrated heater activates when the chamber drops below 25 °C, maintaining consistent curing conditions.

High & Low‑Speed Printing Modes

Switch seamlessly between fast printing for rapid prototypes and a low‑speed mode that prioritizes surface finish and detail—ideal for showcase or fine‑mechanical parts.

Wi‑Fi Connectivity

Connect via the ChituBox app to receive firmware, AI updates, and enable cluster printing across multiple Saturn 4 Ultra units.

Quick‑Release Build Plate

The hinged quick‑release design lets you remove the plate without handling resin, simplifying cleanup and reducing cross‑contamination risk.

Resin Vat Pouring Spouts

Dual spouts positioned at opposing corners allow effortless draining of excess resin without moving the build plate.

Capacitive Touchscreen

A 4‑inch vertical capacitive display offers intuitive navigation and real‑time status updates, enhancing the user experience.

COB + Fresnel Collimating Lens

The COB LED (405 nm) paired with a Fresnel lens achieves only 0.5% astigmatism and 92% field uniformity, ensuring uniform exposure and sharp edges throughout the build volume.

PFA Release Film

Non‑stick PFA film enables easy detachment of prints, reduces the need for frequent replacements, and improves overall longevity.

Plastic Resin Drip Tray Attachment

The tray captures resin drips during plate removal, keeping the workspace clean and saving time on cleanup.

Specifications

Printing Parameters

• System: EL3D‑4.0
• Interface: 4‑inch capacitive touchscreen
• Slicer: ChituBox
• Connectivity: USB & Wi‑Fi

Printing Specifications

• Technology: MSLA (Stereolithography)
• Light Source: COB + Fresnel Lens (405 nm)
• XY Resolution: 19 × 24 µm (11,520 × 5,120)
• Z‑Axis Accuracy: 0.02 mm
• Layer Thickness: 0.01–0.2 mm
• Max Speed: 150 mm/h
• Power: 100–240 V 50/60 Hz; 24 V 6 A

Hardware Specifications

• Dimensions: 327.4 mm × 329.2 mm × 548 mm
• Build Volume: 218.88 mm × 122.88 mm × 220 mm
• Package Size: 660 mm × 450 mm × 450 mm
• Gross Weight: 19.3 kg
• Net Weight: 14.5 kg

Benefits

• Automatic leveling eliminates setup errors.
• High‑speed printing shortens production time.
• Built‑in AI camera simplifies monitoring and timelapse capture.
• Quick‑release plate and spouts reduce mess.
• Pre‑check diagnostics ensure reliable operation.
• Model history enables easy reprinting.

Limitations

• The hinged lid requires extra clearance behind the unit.
• Initial test model required a 35‑second bottom exposure, which made removal difficult; 25 s is more practical.

Unboxing & Assembly

The Saturn 4 Ultra arrives well‑packaged with all necessary accessories. Unboxing is straightforward: remove the outer box, lift the printer, and slide the build plate onto the platform. Power up, fill the vat to the max line, and let the self‑check run. Close the lid, insert your USB drive, and load the bundled Elegoo Rook test model. Wi‑Fi setup is performed via the on‑screen menu.

For custom models, download the latest ChituBox slicer and ChituManager for timelapse features.

Print Quality

All test prints were executed at 0.05 mm layer height, yielding sharp detail comparable to industry standards. Models from Fotis Mint and the bundled Elegoo Rook demonstrate the printer’s capability.

Elegoo Rook

A 35‑second bottom exposure made the base difficult to remove; a 25‑second exposure improved release. The print still exhibits fine surface finish and dimensional accuracy.

Walter White

Glossu Rabban

Venom Snake

Kratos

The Saturn 4 Ultra delivers consistent, high‑quality prints, making it a strong recommendation for both beginners and seasoned hobbyists. Its thoughtful design and feature set position it as a forward‑thinking investment in resin printing.

Purchase the Elegoo Saturn 4 Ultra directly from the manufacturer’s website for the latest firmware and accessories.

Michael Dwamena

Michael Dwamena is the founder of 3D Printerly, a platform dedicated to simplifying 3D printing for hobbyists and professionals alike. With over 20 3D printers and 900+ published articles, he guides millions through the evolving world of 3D printing.