For a compact 9K resin format with Wi-Fi
Elegoo Mars 4 Ultra
An MSLA resin printer with a monochrome 9K screen, a 153.36 × 77.76 × 165 mm build volume, and Wi-Fi transfer per Elegoo.
In short The Elegoo Mars 4 Ultra is an resin (MSLA) 3D printer with a 153.36 × 77.76 × 165 mm (6 × 3.1 × 6.5 in) build volume. Elegoo claims a 7-inch 9K LCD, 18 µm XY resolution and up to 150 mm/h.
Documentary analysis · Not personally tested
Resin · MSLAWhy consider it?
A 9K screen at 8520 × 4320 pixels with 18 μm XY resolution, a speed advertised up to 150 mm/h, 2.4G/5G Wi-Fi transfer, and 4-point leveling per Elegoo.
What to verify
Manual 4-point leveling despite the cover; the compact footprint limits part size to miniatures and small detailed objects.
Elegoo Mars 4 Ultra specifications
- Technology
- Resin (MSLA)
- Build volume
- 153.36 × 77.76 × 165 mm (6 × 3.1 × 6.5 in)
- Enclosure
- Protective cover
- LCD screen
- 7 in · 9K
- XY resolution
- 18 µm
- Claimed print speed
- 150 mm/h
- Multicolor
- One resin at a time; no automatic color or material switching.
- Materials
- Compatible 405 nm UV resins for MSLA; profile and post-processing steps specific to each product, with a compatible USB air purifier.
- Screen
- 4-inch touchscreen
- Connectivity
- Wi-Fi
- Listed features
- Built-in air filtration
Source: official Elegoo pages (elegoo.com), checked September 28, 2026. Manufacturer claims, not our measurements. Build volume is nominal: orientation, supports and reserved zones can reduce the usable space.
Which projects is it for?
The Mars 4 Ultra is an MSLA resin printer with a monochrome 9K screen and a 153.36 × 77.76 × 165 mm build volume per Elegoo's listing. This compact footprint suits figurines, miniatures, and detailed parts, where resin captures fine surface detail that FDM struggles to match.
The advertised speed reaches 150 mm/h thanks to the COB light source and Fresnel collimating lens, a speed gain over older printers in the Mars lineup while keeping a compact desktop footprint.
Materials and setup
The printer runs compatible 405 nm UV resins, each with its own profile and post-processing steps per Elegoo. The manufacturer recommends following the profile supplied for the chosen resin rather than reusing settings from another machine.
Only one resin can be loaded at a time: there is no automatic color or material switching on this model. The built-in USB air purifier is advertised to help limit odors during printing.
What the bundle includes or not
The box includes the printer, Wi-Fi antenna, and a USB air purifier per Elegoo's "What's in the Box" list, with the build platform and resin tank offered as separate accessories on some listings. Before buying, check the retailer's listing to confirm whether the tank and platform are included in your specific offer.
Leveling stays manual via a 4-point system, despite a laser-engraved build plate advertised to improve adhesion during printing.
Alternatives to compare
For a larger format with the same type of monochrome screen, the Mars 5 Ultra offers a slightly bigger volume with a newer interface. For a tighter budget, the Mars 5 stays on a 4K screen at an entry-level price.
The resin printer buying guide and the resin materials guide help prepare for post-processing before starting out on this type of machine.
Similar printers to compare
Sources and limits
- Source: official Elegoo pages (elegoo.com), checked September 28, 2026. Manufacturer claims, not our measurements.
- How we assess specifications
We have not measured noise, real printing speed, accuracy or reliability, so none of these is rated here.