RESIN_PRINTING_101
ZERO-TO-FIRST-PRINT ▸ THE FUNDAMENTALS OF MSLA RESIN PRINTING
inew3d QC2A — Full-Color Resin — coming soon, ETA Jul 2026 — Desktop photopolymer jetting. CMYK-W cartridge system — 500K+ color gamut.
> WHAT_IT_IS
MSLA (Masked Stereolithography) uses a UV light source shining through an LCD screen to cure liquid photopolymer resin one entire layer at a time. Unlike FDM (which draws lines), resin prints cure the whole layer simultaneously — much faster per layer, vastly higher detail.
How it works: A build plate dips into a vat of liquid resin. UV light projects the layer shape through the bottom of the vat. The cured layer sticks to the build plate. The plate lifts, fresh resin flows in, and the next layer cures. This repeats — upside-down.
> RESOLUTION
The Saturn 16K has 0.014mm (14µm) XY pixels. For comparison, FDM nozzles are 0.4mm. That's 28× finer. Layer heights as low as 0.01mm (10µm). You literally cannot see layer lines on a well-printed resin part.
> SAFETY_⚠_CRITICAL
Liquid resin is a sensitizer and irritant.
- ▸ Nitrile gloves ALWAYS when handling liquid resin or uncured prints
- ▸ Safety glasses mandatory
- ▸ Work in ventilated area — HEPA scrubber running
- ▸ Resin fumes are not harmless
- ▸ Cured (fully hardened) resin is safe to handle bare-handed
> RESIN_TYPES
> POST-PROCESSING
Print → remove from plate → IPA wash (removes uncured surface resin) → support removal → UV post-cure (fully hardens part). Skipping any step = sticky, weak, dimensionally wrong parts.
> FEP_&_VAT_CARE
- ▸ FEP film is a consumable — gets cloudy, scratched, dented. Replace when prints fail in the same spot.
- ▸ Never scrape the FEP with metal tools. Plastic spatula only.
- ▸ Resin temperature matters: cold = thick = slow flow = failures. Ideal: 20–30°C (68–86°F).
- ▸ Never pour used resin back into the bottle — contaminated with partially cured particles.
- ▸ Filter through fine mesh paint strainer if reusing. Better: keep a "working vat" and top up.
- ▸ Empty and clean the vat completely between resin type changes.
> BLENDS_&_REPRODUCIBILITY
Pure standard resin is brittle. Adding 5–10% Tenacious (flexible resin) dramatically improves toughness without visible loss of detail.
Document what ratio you used — reproducibility matters. Write it on the build plate label or in the job notes.