3d-printingHow-ToBeginner · 4 min read

How to Set Exposure Time for Resin Printing: Step-by-Step Guide

To set the exposure time for resin printing, start by checking the resin manufacturer's recommended settings and your printer's default values. Adjust the exposure time based on print results, increasing it if layers don't cure well or decreasing it if prints are overexposed or brittle.

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Syntax

Exposure time is usually set in your resin printer's software or on the printer's control panel. It is measured in seconds and controls how long UV light cures each layer of resin.

Initial Layer Exposure Time: Longer time to ensure the print sticks to the build plate.
Normal Layer Exposure Time: Time for curing each subsequent layer.
Adjustment: Modify these times based on resin type and print quality.

python

exposure_time = recommended_time  # seconds
initial_layer_exposure = recommended_initial_time  # seconds

# Example adjustment logic
if layers_not_curing:
    exposure_time += 2  # increase exposure
elif layers_overexposed:
    exposure_time -= 1  # decrease exposure

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Example

This example shows how you might adjust exposure times based on print results using simple logic in a resin printer's software or manual settings.

python

def adjust_exposure(current_exposure, issue):
    if issue == 'under_cured':
        return current_exposure + 2
    elif issue == 'over_cured':
        return max(current_exposure - 1, 1)  # exposure can't go below 1 second
    else:
        return current_exposure

# Starting exposure time recommended by resin
exposure_time = 8  # seconds

# Simulate print issue
print_issue = 'under_cured'

# Adjust exposure time
new_exposure = adjust_exposure(exposure_time, print_issue)
print(f'Adjusted exposure time: {new_exposure} seconds')

Output

Adjusted exposure time: 10 seconds

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Common Pitfalls

Common mistakes when setting exposure time include:

Using the same exposure time for all resins without adjustment.
Setting exposure too low, causing layers to not cure properly and prints to fail.
Setting exposure too high, leading to overcured, brittle prints or loss of detail.
Ignoring initial layer exposure time, which can cause poor adhesion to the build plate.

Always test with small prints and adjust incrementally.

python

wrong_exposure = 3  # seconds, too low for most resins
correct_exposure = 8  # seconds, typical starting point

# Wrong approach
print('Print likely to fail with exposure:', wrong_exposure)

# Correct approach
print('Better print quality with exposure:', correct_exposure)

Output

Print likely to fail with exposure: 3 Better print quality with exposure: 8

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Quick Reference

Here is a quick guide to exposure times for common resin printing scenarios:

Print Stage	Typical Exposure Time (seconds)
Initial Layers	30-60
Normal Layers	6-12
Flexible Resin	10-20
Standard Resin	6-10
High Detail Resin	8-12

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Key Takeaways

Start with the resin manufacturer's recommended exposure times and adjust based on print results.

Use longer exposure for initial layers to ensure good adhesion to the build plate.

Increase exposure time if layers do not cure properly; decrease if prints are brittle or overexposed.

Test with small prints and adjust exposure incrementally to find the best setting.

Different resins and printers require different exposure times; never assume one size fits all.