Part Defects

Overcure

14min

Overcure
Additional resin cured at the edges of a slice in the XY plane.
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How to Identify
Overcure can be diagnosed as follows:
Features appear too large or distorted
Holes or small features are too small
Engraved or embossed text appears blurry
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Cause - Inconclusive
Cause - Inconclusive
Troubleshooting
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Process, Material, and Hardware Checks
If any of these conditions apply to your print, take the corrective action and reprint to see if the problem is resolved.
Check the expiration date of your resin lot.
Ensure all two-part resin prints are completed within the resin's pot-life.
Ensure that one-part resins are emulsified. Invert bottle 5-6 times to distribute pigment.
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Print Preparation or Part Design Adjustments
The following solutions will address print or part-related causes of the defects. Choose among the suggested actions below and select the best approach for your application. Usually only one type of adjustment is needed.
Add more space between parts; increase padding in auto-layout.
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Use correction scale﻿ to bring part features into your specification range by adjusting the X and Y scale factors.
Automatic scale factors account for inaccuracies in the majority of cases, but tweaking the scale factor further may help dial in your feature sizes in some cases.
Use DLS Design Guidelines﻿ for holes in the XY plane to bring part features into your specification range. Reference the tips for optical effects in Recommended Feature Sizes﻿ for horizontal holes (XY).
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Reference Print Plan Adjustments﻿ for guidance on the following parameters:
﻿5 Exposure Parameters﻿ 
Exposure Timing Parameters
Exposure Timing
If problems persist, please reach out to Carbon Support.
Explanation & Causes
Explanation
Overcure - XY Plane
Overcure is caused by light scattering horizontally at the edges of a slice, where the material is thinner and less opaque. This scattered light cures resin adjacent to the part and typically causes an additional 0.010 - 0.075mm of part curing. This effect is more significant in smaller cavities due to higher local temperatures.
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Causes
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Root Issue
Problem
Why Defect Presents
Layout
Parts are too close together
When parts are not spaced properly, light can scatter causing more overcure than expected.
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Root Issue
Problem
Why Defect Presents
Cleaning
Cassette window is dirty
Dust, spots, or streaks can cause UV light to scatter causing more overcure than expected.
Cleaning
Deck glass is dirty (M1/M2)
Projector lens is dirty (M3/M3 Max/L1)
Dust, spots, or streaks can cause UV light to scatter causing more overcure than expected.
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Root Issue
Problem
Why Defect Presents
Expired
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Resin that is expired may not mix properly which could cause light to scatter and create more overcure than expected.
Past pot-life
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Resin that is past its pot-life may begin to partially cure which could cause light to scatter and create more overcure than expected.
Mixing
One-part resin not mixed
Pigment that is not fully emulsified in the resin could cause light to scatter and create more overcure than expected.
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Printing Stage
Parameter Type
Type of Adjustment
Why Defect Presents
5 Exposure
Exposure Timing
﻿Increase﻿
More UV exposure increases overcure
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Root Issue	Problem	Why Defect Presents
Layout	Parts are too close together	When parts are not spaced properly, light can scatter causing more overcure than expected.

Root Issue	Problem	Why Defect Presents
Cleaning	Cassette window is dirty	Dust, spots, or streaks can cause UV light to scatter causing more overcure than expected.
Cleaning	Deck glass is dirty (M1/M2) Projector lens is dirty (M3/M3 Max/L1)	Dust, spots, or streaks can cause UV light to scatter causing more overcure than expected.

Root Issue	Problem	Why Defect Presents
Expired		Resin that is expired may not mix properly which could cause light to scatter and create more overcure than expected.
Past pot-life		Resin that is past its pot-life may begin to partially cure which could cause light to scatter and create more overcure than expected.
Mixing	One-part resin not mixed	Pigment that is not fully emulsified in the resin could cause light to scatter and create more overcure than expected.

Printing Stage	Parameter Type	Type of Adjustment	Why Defect Presents
5 Exposure	Exposure Timing	Increase	More UV exposure increases overcure

Over-Adhesion

Pillowing

Overcure

How to Identify

Troubleshooting

Process, Material, and Hardware Checks

Resin

Print Preparation or Part Design Adjustments

Layout

Scale

Design

Print Plan Adjustments

Explanation & Causes

Explanation

Causes