ELEGOO Metal Resin Tank for Mars 4 LCD 3D Printer: Review, Pros & Cons

Summary

An aluminum-alloy replacement resin vat for the ELEGOO Mars 4 and Mars 4 Ultra, with the release film pre-installed and identical 209 × 140 × 32.8 mm dimensions across both variants. Check which film you need before ordering: the Mars 4 version uses FEP, the Mars 4 Ultra version uses ACF, and the two are not interchangeable.

Strengths

Aluminum alloy body is more durable than a plastic vat and is cheap to replace.
Release film comes pre-installed, so the tank is ready to use.
Feet on the bottom keep the film off the workbench.
Works with all resin types.
Neat screws secure the tank in place.
Both variants share dimensions, so mounting is consistent.

Weaknesses

The film is a consumable: it clouds and scratches with use.
The aluminum body can leak at seams.
Owner feedback for this accessory is limited to two one-line store reviews.
Cover inclusion is confirmed only for the Ultra variant.
The FEP versus ACF performance difference is unquantified beyond manufacturer claims.
No independent instrumented test of the accessory exists.

Verified specifications

Product	metal resin tank / resin vat for the ELEGOO Mars 4 or Mars 4 Ultra, variant-dependent.
Dimensions	209 × 140 × 32.8 mm, both variants.
Construction	aluminum alloy tank body.
Release liner	pre-installed FEP film (Mars 4 variant) or pre-installed ACF film (Mars 4 Ultra variant).
Compatibility	“Mars 4” (FEP variant) or “Mars 4 Ultra” (ACF variant).
Resin suitability	works with all types of resin.
Mounting	neat screws fix the tank in place; feet on the bottom keep the film off the workbench.
Installation hardware	3 Allen wrenches (FEP variant); Allen wrench (Ultra variant).
Tank cover	confirmed included with the Ultra/ACF variant; not stated for the FEP/Mars 4 variant.
US SKUs	SPUS-EL-3D-217 (Mars 4/FEP); SPUS-EL-3D-223 (Mars 4 Ultra/ACF).
Global SKUs	SPUK-EL-3D-217 and SPUK-EL-3D-223.
Weight	not stated on the manufacturer pages read.
Warranty	ELEGOO’s warranty policy classifies consumables such as release film as excluded or limited-warranty items.

Full research notes and sources

Variants and compatibility

ELEGOO sells two tanks with identical 209 × 140 × 32.8 mm dimensions and aluminum-alloy construction: one for the Mars 4 with FEP film (SKU SPUS-EL-3D-217) and one for the Mars 4 Ultra with ACF film (SKU SPUS-EL-3D-223). The Mars 4 version is $32.99 and the Mars 4 Ultra version is $37.99 on ELEGOO’s US store; the global store lists both at $47.99 under the UK SKUs. The film is pre-installed on both, confirmed by store Q&A for the Mars 4 variant. The Ultra variant ships with a tank cover per store Q&A; the FEP variant’s page does not state a cover.

Film wear and leaks

The film is the part that wears: it clouds and scratches with use, and the aluminum body can develop leaks at seams. Because the film is a consumable, the metal body is the durable part and the full tank is worth replacing when the body is damaged or leaking. If only the film is worn, a film-only replacement may suffice, though ELEGOO’s pages do not confirm film is sold alone.

Evidence and ownership

ELEGOO’s warranty policy classifies consumables such as release film as excluded or limited-warranty items, and no further warranty specifics for this accessory were found.

Is it worth it?

At $32.99 the FEP tank is a reasonably priced consumable replacement when the vat is worn or leaking; the metal body outlasts a plastic vat but the film still wears. At $37.99 the ACF version carries a $5 premium that reflects the ACF film; the difference cannot be quantified beyond manufacturer claims, since no professional comparison between FEP and ACF was found.

Which model this is

This page covers the ELEGOO metal resin tank sold for the Mars 4 series. ELEGOO sells two variants with identical dimensions: a Mars 4 version with FEP film and a Mars 4 Ultra version with ACF film. The supplied ASIN B0F1D2GY2Y resolves to a listing titled for FEP film, which conflicts with a spec that said ACF; the ACF version is a separate product. Match the tank to your printer and film type, and verify the liner material on the box. Do not confuse this with ELEGOO’s Mars 3, Mars 4 DLP, or Mars 4 Max resin tanks, which are different sizes.