Elegoo Saturn S (Resin 3D Printer)¶
Introduction¶
The Elegoo Saturn S is a masked-stereolithography (MSLA) resin 3D printer recently acquired by the lab. Unlike the lab's FDM (filament) printers, which extrude melted thermoplastic, the Saturn S cures liquid photopolymer resin layer by layer using a UV-backlit monochrome LCD. This gives it much finer resolution and smoother surface finish than FDM, at the cost of a smaller build volume, higher per-part material cost, and a very different, and more hazardous, workflow.
Intended use case in the lab: high-resolution prototyping and small precision parts where FDM layer lines or dimensional tolerances are a problem, such as small mechanical fixtures, connectors, gears, enclosures for small sensors or electronics, and presentation-quality prototypes. It is not a replacement for the FDM printers for larger structural parts, brackets, or anything printed in engineering thermoplastics; the Saturn S's build volume is small and standard photopolymer resins are more brittle than most FDM filaments.
Because liquid resin is a skin sensitizer/irritant and toxic before curing (see Safety and Handling below), this printer has different handling rules than the FDM machines and should be treated as shared lab equipment with a mandatory safety procedure, not a walk-up-and-print tool.
Key Specifications¶
| Spec | Value |
|---|---|
| Technology | MSLA (masked stereolithography), LCD photocuring |
| LCD / Light source | 9.1" 4K monochrome LCD, 405 nm UV, 54 UV LEDs |
| XY resolution | 0.048 mm (4098 x 2560 pixels) |
| Build volume | 196 mm (L) x 122 mm (W) x 210 mm (H) |
| Z-axis accuracy | 0.00125 mm |
| Layer thickness range | 0.01-0.15 mm |
| Print speed | 30-70 mm/h (approx. 2-3 sec per layer) |
| Slicer | ChiTuBox (native format) |
| Connectivity | USB, 3.5" touchscreen interface |
| Power | 100-240 V AC in, 24 V / 4 A (96 W) out |
| Resin compatibility | Standard 405 nm UV photopolymer resins; not filament |
| Odor control | Replaceable activated-carbon filter |
Source: ELEGOO Saturn S 4K Resin 3D Printer — official product page.
Elegoo's Saturn line includes several distinct models: Saturn, Saturn S, Saturn 2, Saturn 3, Saturn 3 Ultra, Saturn 4 Ultra, and others. "Elegoo Saturn S" is a real, distinct, officially sold product (a 9.1" 4K mono-LCD MSLA printer, distinct from the plain Saturn and from the later Saturn 2/3/4 generations), confirmed via Elegoo's own product listing; it is not a typo or substitute name for the Saturn 2/3/Ultra models. That said, confirm the exact model against the physical unit and its box label, since Elegoo's naming across the Saturn line is easy to confuse, and any lab-specific slicer profile should match the unit actually on hand.
Getting Started: Slicing Software Setup¶
- Install ChiTuBox (the free Basic edition is sufficient for most parts); Elegoo also offers its own slicer app, but ChiTuBox is more widely used in the community and has better support documentation.
- Select the correct printer profile in ChiTuBox: Elegoo Saturn S specifically, not Saturn, Saturn 2, or Saturn 3, since profiles differ in LCD resolution and build volume and will distort prints if mismatched.
- Import your model, orient it, add supports (ChiTuBox has an auto-support tool; angle parts to minimize supports on visible or functional surfaces), and slice.
- Export the sliced file to the printer's USB drive and load it via the touchscreen.
- Level the build plate and check the vat/FEP film before every print; an unlevel plate or damaged film is the most common cause of a failed print sticking to the LCD/vat.
- After printing, parts must go through the wash-and-cure workflow below before they are safe to handle bare-handed or usable as a finished part; printing is not done when the printer stops.
Safety and Handling¶
Read this section before touching the printer, the resin, or a freshly printed part.
Resin printing differs fundamentally from the lab's FDM printers from a safety standpoint. Uncured (liquid) photopolymer resin is a known skin and respiratory irritant/sensitizer, and repeated skin contact can cause an allergic sensitization that worsens with subsequent exposure. Treat all uncured resin, on parts, tools, gloves, in the vat, and in wash liquid, as a hazardous chemical, not as ordinary 3D printing supplies. This is a shared-equipment safety matter: anyone using this printer is responsible for not creating a hazard for the next person.
PPE is mandatory whenever handling liquid resin or freshly printed (uncured or partially cured) parts: nitrile gloves, not latex, since resin can degrade latex, changed if resin gets on them beyond incidental contact; eye protection when pouring resin or handling anything that could splash; and avoiding bare-skin contact entirely, with long sleeves recommended when pouring resin.
Run the printer in a well-ventilated area, ideally with local exhaust, not a small closed room; uncured resin off-gasses even when the printer is idle with resin in the vat, so keep the vat lid or printer cover closed when not actively printing.
Post-processing workflow, every print, every time: wash the part in an IPA (isopropyl alcohol) wash station to remove uncured resin from the surface, wearing gloves throughout; cure the washed, dried part under a UV curing station for the recommended time to fully polymerize the surface resin; do not skip curing because a part looks solid, since surface tackiness and incomplete cure are not always visually obvious.
Waste disposal: uncured liquid waste resin is chemical waste, not household or general waste, and must not go down the drain or into regular trash; UV-cure waste resin where possible before disposal, since cured resin is inert and much lower-hazard; resin-contaminated gloves, paper towels, and wipes should be treated as contaminated waste until confirmed otherwise by EHS; do not pour used IPA down the drain. Do not combine this printer's cleanup materials with the FDM printers' waste stream; filament scraps are not chemically hazardous in the way liquid resin is, and mixing the two waste streams risks giving the wrong disposal treatment to the resin waste.
If you are unsure whether something (a spill, a discarded part, a container of used IPA) is safe to throw away, stop and ask rather than guessing.
References¶
ELEGOO Saturn S 4K Resin 3D Printer — official product page; ELEGOO New Machine: Saturn S announcement; ChiTuBox slicer; Elegoo Resin MSDS/SDS index.
Migration note: this page was newly authored from public Elegoo manufacturer documentation, since the lab acquired this printer after the original wiki migration and it did not exist in prior wiki content. The exact model designation should be double-checked against the physical unit and its packaging before relying on this page for slicer profile selection. Lab-specific details, including where resin is stored, where the UV curing station and IPA wash station are physically located, exact waste-resin and contaminated-PPE disposal procedures, and any required sign-off/training, are not yet filled in and need to be added by lab members, and must be confirmed against Queen's University Environmental Health and Safety (EHS) requirements before this printer is used by anyone who has not been trained on it.
