ELEGOO Mars 3: problems, parts and running costs

Checked: 2026-10-16

Summary

The Mars 3’s recurring owner complaints are about workflow and consumables rather than print quality: the mainboard shipped locked to CHITUBOX, there is no built-in air filter or hood seal, and the vat’s FEP film is a wear item. Running costs are the standard resin basket — 405 nm resin, IPA, FEP films, gloves and masks — but the sources capture no yearly totals, so treat the list below as items rather than a budget. By 2026 it is a superseded 2021 design, worth buying only at a clear discount against ELEGOO’s Mars 4 and Mars 5 series.

Common problems and fixes

CHITUBOX slicer lock-in — the mainboard shipped accepting only CHITUBOX’s encrypted CTB format, which blocked Lychee Slicer until an SDK-based fix arrived in 2022; it is a software limitation, not a hardware fault, and not a warranty matter. [1][3]
No built-in air filter and no hood seal — VOC and smell management is entirely on the user, a step back from the Mars 2 Pro; ventilation, gloves and IPA handling are required. [3]
FEP film wear — the vat release liner loosens over long use and needs replacement; ELEGOO publishes an official guide for replacing the FEP film (FEP2.0 for the Mars 3). [2][6]
Manual leveling after build-plate changes — leveling uses the supplied Allen key and the A4-paper method and must be redone after any build-plate screw change. [2]
No Wi-Fi, camera or remote printing — a USB stick is the only workflow, with the host port on the front. [3]
Intermittent print failures — one owner reported chronic failures where only the test print or one or two prints succeeded, with the unit arriving in damaged packaging; this is a single caution signal, not a defect rate. [11]

Parts and consumables

FEP release film (FEP2.0 for the Mars 3) — a wear item replaced when it loosens; ELEGOO publishes an official replacement guide. [2][6]
6.6-inch 4K mono LCD screen — user-replaceable with an official ELEGOO guide, and covered for 3 months rather than the machine’s one-year warranty. [5][6][7]
405 nm resin — no resin ships with the printer, so the buyer sources it separately. [2][4]
Nitrile gloves, mask and IPA — required for handling resin and cleaning prints. [2][3]
Build plate and resin vat — user-serviceable; the LCD and mainboard are not user-repairable. [2][6]

Yearly running cost

Not enough data.

When it is a good buy

Reviewers in 2021 and 2022 treated roughly $300 as the typical price (All3DP and Tech Up Your Life; Treatstock listed a $300 average), but the sources note that is historical and not a 2026 US price. In 2026 the Mars 3 is a five-year-old design and ELEGOO’s Mars 4 and Mars 5 series add auto-leveling and higher resolution, so it is a good buy only at a clear discount versus those, or used and open-box. Buy the Mars 4 or Mars 5 series instead if you are paying entry-level money for a new machine; a used Mars 3 makes sense mainly as a cheap second resin printer for miniatures.