Part Defects

Incomplete Lattice

11min

Incomplete Lattice 
Lattice prints with a gap.


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How to Identify
Incomplete lattice can be diagnosed as follows:
Vertical struts have a gap or are missing.
Horizontal struts have a gap in the center.
The strut may have excess cured resin at the ends where the gap occurs.
﻿Layering﻿  arises from the same issue but appears on surfaces instead of lattice struts.
Cause - Inconclusive
Cause - Inconclusive
Occurs at vertical struts
Cause - Inconclusive 
Occurs at horizontal strut
Troubleshooting
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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 struts to provide more structure at the problematic struts. 
The performance of the lattice will change.
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Reference Print Plan Adjustments﻿ for guidance on the following parameters:
﻿1 Pump Up Parameters﻿ 
Pump Height Parameters
Minimum Pump Height
Distance from Peak Multiplier
Minimum Distance from Peak
Platform Speed Parameters
Motor Speed Up
﻿Other Parameters﻿ 
Enhanced EPU Force Feedback Enabled
If problems persist, please reach out to Carbon Support.
Explanation & Causes
Explanation
An incomplete lattice is formed when struts are unable to break free of the surface tension at the dead zone during the pump up stage of printing a slice. This creates two issues:
Prevents resin from flowing in for the next slice
Leaves the latticed stretched out, overlapping with the next slice.
When the lattice proceeds normal in a subsequent slice, a gap is left behind in the lattice.
This defect usually occurs with elastomeric resins that are soft and pliable during printing.
Reference DLS Printer Dynamics﻿ for more information on the stages of printing a slice.
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Lattice does not break surface tension at dead zone and resin does not flow below part for next slice.
The next slice only cures where resin was able to flow.
The next slice proceeds normally but a gap has been left in the lattice.
Z dimensions for pump height and slice thickness are exaggerated for visibility.
Causes
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Root Issue
Problem
Why Defect Presents
Designed


Lattice is designed to have longer struts.
Longer struts (> 5-10 mm) are more likely to be stretched rather than break free of the dead zone surface tension. Most commonly seen with horizontal or vertical struts.
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Printing Stage
Parameter Type
Type of Adjustment
Why Defect Presents
1 Pump Up
Pump Height
﻿Decrease﻿
A small pump height is less likely to break the dead zone's surface tension.
1 Pump Up
Platform Speed
﻿Increase﻿
Increased Motor Up Speed leaves less time for the surface tension to be broken.
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Root Issue	Problem	Why Defect Presents
Designed	Lattice is designed to have longer struts.	Longer struts (> 5-10 mm) are more likely to be stretched rather than break free of the dead zone surface tension. Most commonly seen with horizontal or vertical struts.

Printing Stage	Parameter Type	Type of Adjustment	Why Defect Presents
1 Pump Up	Pump Height	Decrease	A small pump height is less likely to break the dead zone's surface tension.
1 Pump Up	Platform Speed	Increase	Increased Motor Up Speed leaves less time for the surface tension to be broken.

Gouging

Layering