How do I find the correct exposure time?

Start with the manufacturer recommended time and print an exposure test (like the Resin XP2 validation matrix or AMERALABS town). Adjust in 0.2-0.3s increments. Under-exposure causes layer separation; over-exposure causes loss of detail.

Why do bottom layers need longer exposure?

Bottom layers need extra exposure (typically 10-15x normal) to create a strong bond to the build plate. Without enough bottom exposure, the print will detach and fail. Too much causes elephant foot (enlarged base).

What is the difference between mono and RGB screens?

Mono (monochrome) LCD screens transmit 2-3x more UV light than RGB screens, requiring much shorter exposure times (2-3s vs 6-10s). Mono screens also last 3-4x longer. Most modern printers use mono screens.

Does layer height affect exposure time?

Yes, thicker layers need proportionally more exposure. 0.05mm layers need roughly half the exposure of 0.1mm layers. The UV light must penetrate and cure the full depth of each layer.

3DPrintCalcs

Exposure Time Calculator — Layer Exposure Settings

Calculate layer exposure time based on resin type, layer height and UV power.

Resin Type

Layer Height

Screen Type

UV Power

How We Calculate This

Exposure Time Formulas

Normal exposure = Base time x Screen multiplier x Layer factor x Power factor
Bottom exposure = Base bottom time x Screen multiplier x Power factor
Layer factor = Your layer height / 0.05mm (reference)

These are starting point estimates. Every resin, printer, and screen combination is different. Always run an exposure calibration test for your specific setup. Adjust in small increments (0.2-0.5s) for fine-tuning.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify settings with test prints before committing to final prints.