Slide 002: Resin Slicer Settings and Exposure Calibration

Slide Visual

Slide Overview

This slide covers the essential slicer settings for resin printing and the exposure calibration process. Unlike FDM where many settings have well-known defaults, resin printing exposure times vary by printer, LCD age, resin type, resin color, and ambient temperature — making calibration a required skill.

Instruction Notes

Critical Resin Slicer Settings

Exposure Settings (most important): - Normal exposure time: Duration UV light exposes each layer (typically 1.5-3.5 seconds for mono LCD) - Bottom exposure time: Extended exposure for first layers (typically 25-60 seconds) - Bottom layer count: Number of layers receiving extended exposure (typically 5-8) - Transition layers: Gradual exposure reduction from bottom to normal (3-5 layers recommended)

Mechanical Settings: - Lift distance: How far the platform rises for peel (5-10mm standard) - Lift speed: Speed of upward peel movement (1-3 mm/s — slower = gentler peel) - Retract speed: Speed of downward return (3-6 mm/s — can be faster than lift) - Light-off delay / rest time: Pause before exposure for resin leveling (1-5 seconds)

Layer Settings: - Layer height: Vertical resolution (0.025-0.100mm; 0.050mm most common) - Anti-aliasing: Smooths staircase edges by partially exposing boundary pixels (4-8x recommended)

Exposure Calibration Process

The manufacturer's recommended exposure time is a starting point. Actual optimal exposure depends on: - LCD screen age (older screens transmit less UV) - Ambient temperature (cold resin cures slower) - Resin age and batch variation - Specific printer UV power output

The RERF Test (Resin Exposure Range Finder): Most resin slicers include a built-in calibration test that prints multiple copies of the same pattern at different exposure times on a single print. Process: 1. Select the RERF test or download a calibration model (e.g., Cones of Calibration, AmeraLabs Town) 2. Print the test — it creates 4-8 copies at different exposures in a single print 3. Evaluate each copy: - Under-exposed: soft, incomplete features, supports break easily, holes in thin walls - Correctly exposed: crisp details, thin features intact, dimensions accurate - Over-exposed: features bloated, holes smaller than designed, edges rounded 4. Select the lowest exposure time that produces complete, accurate features

Exposure Effect on Dimensional Accuracy

Exposure Level	XY Accuracy	Detail Quality	Strength
Under-exposed	Parts too small	Missing fine features	Weak, brittle
Slightly under	Close to nominal	Most features present	Adequate
Optimal	±0.05mm	All features sharp	Full properties
Slightly over	Parts 0.05-0.1mm large	Slight rounding	Slightly stronger
Over-exposed	Parts 0.1-0.3mm large	Features merged/lost	Brittle (over-cured)

Color-Specific Exposure Adjustments

From the same manufacturer, same resin formula, different colors require different exposure times due to pigment UV absorption: - Clear/Transparent: -20% from standard grey - White: -10% from standard grey - Grey: baseline (most calibration data uses grey) - Green/Blue: +0-10% - Red/Orange: +10-20% - Black: +30-50%

Key Talking Points

1. Exposure calibration is not optional — it is the foundation of successful resin printing and must be repeated when changing resin type, color, or when the LCD ages
2. The optimal exposure is the MINIMUM exposure that produces complete features — more is not better, it causes dimensional bloat
3. Anti-aliasing is essentially free quality improvement — always enable it at 4-8x for smoother surfaces

Learning Objectives (Concept Check)

• [ ] Students can identify and configure all critical resin slicer settings
• [ ] Students can perform an exposure calibration test and select the optimal exposure time
• [ ] Students can predict how resin color affects required exposure time

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Last Updated: 2026-03-19