ELEGOO Mars 4 Ultra 9K Resin 3D Printer: features, specs and uses

The ELEGOO Mars 4 Ultra is a desktop resin 3D printer that uses MSLA technology. It is built for small, highly detailed models such as miniatures, figurines and prototypes. Here is how the main specs work and what to plan for before setting up resin printing.

How MSLA printing works

Instead of melting plastic, an MSLA (masked stereolithography) printer cures liquid resin with light. An LCD screen acts as a mask, letting UV light through in the shape of each layer, and the model builds up layer by layer on a plate that rises from the resin vat. Because a whole layer is cured at once, print time depends on the model's height more than on how many parts are on the plate.

What a 9K screen means

The Mars 4 Ultra has a 7-inch 9K mono LCD at 8520 x 4320 pixels, giving 18 µm XY resolution, according to ELEGOO. Smaller pixels mean finer surface detail on small features such as faces or fabric texture. A monochrome screen passes more light than an RGB one, which typically helps with curing speed. ELEGOO says the screen is protected by 9H tempered glass.

Light source and uniformity

For even curing, ELEGOO says the printer combines a COB light source with a Fresnel collimating lens that produces a vertical, uniform 405 nm beam, with a light angle under 5 degrees and 92% uniformity. That is meant to keep edges and details consistent across the whole plate.

Speed and release film

ELEGOO says the printer can reach up to 150 mm/h with the ACF release liner film and its upcoming RAPID standard resin, which it describes as 3x faster printing. The ACF film is designed to lower release tension as each layer peels away, so ELEGOO says prints succeed more often at higher speeds. Release film is a wear part and will eventually need replacing.

Build volume and setup

The printing size is 6.5 x 6.04 x 3.06 inches. A 4-point leveling system is said to need only one leveling, and the laser-carved build plate surface is meant to improve adhesion and cut print failures. The machine weighs 18 lb (about 8.2 kg) and ships in a box of about 17 x 22 x 22 inches.

Connectivity and controls

A Linux system with 4 GB of RAM runs the printer. It supports Wi-Fi on 2.4G and 5G networks, with a stated transfer speed of 6-10 Mbps and a detachable antenna on the Z axis. A 4-inch IPS touch screen at 800 x 480 pixels supports 12 languages.

Who it suits

It suits hobbyists who print miniatures, tabletop gaming pieces, jewellery masters or detailed display models and who want a compact printer. It is not suited to large objects.

What to check before you buy

• Resin handling: liquid resin is a chemical. Wear gloves, ventilate the room and follow the resin maker's safety instructions.
• Washing and curing: prints normally need washing in solvent and UV curing afterwards, so plan space and equipment.
• Build size: compare the 6.5 x 6.04 x 3.06 inch volume with your models.
• Resin choice: check which resins ELEGOO says work with the printer.
• Consumables: plan for resin, FEP or release film, gloves and cleaning supplies.
• Disposal: uncured resin must be cured before disposal, and local rules may apply.

The short version

• An MSLA resin printer with a 7-inch 9K mono LCD and 18 µm XY resolution.
• Printing size of 6.5 x 6.04 x 3.06 inches.
• ACF release film; up to 150 mm/h with ELEGOO's RAPID resin.
• Wi-Fi on 2.4G and 5G, Linux OS and a 4-inch touch screen.
• Resin handling needs proper ventilation and protection.

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