Part Defects

Salt Baked Into Part

11min

Salt Baked Into Part
Salt remains stuck on parts after they have been rinsed with water post-cure.


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How to Identify
Salt baked into parts can be diagnosed as follows:
Before curing: shiny spots on the part
(Reference Excess Resin defect)
After curing: 
Salt that does not wash or brush off in water
Salt that is discolored, typically a yellow hue
This defect is related to the Excess Resin﻿ defect, which stems from the same issue but manifests differently.
Cause - Inconclusive
Cause - Inconclusive
Cause - Inconclusive
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.
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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.
Redesign part:
Add a fillet or chamfer to tight corners tight corners ≤ 90°.
Provide drainage for blind holes and difficult to access features.
Increase spacing between fine features
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If problems persist, please reach out to Carbon Support.
Explanation & Causes
Explanation
When parts are not fully cleaned, liquid resin remains on the part after washing. When the part is packed in salt for baking (a method of supporting parts during Thermal Curing﻿, the liquid resin is absorbed into the salt and cures with the part.
Features prone to collecting liquid resin and not getting fully cleaned:
Blind holes
Small openings with only one access point
Tight corners (acute angles ≤ 90°)
Tightly packed features
Difficult to access spaces
Areas that solvent cannot access easily
Small features and openings
Such as in a lattice
Note: Only select resins are compatible with salt packing. Reference resin specific protocols﻿ for more information.
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Causes
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Root Issue
Problem
Why Defect Presents
Washing
Blind Holes
Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.
Washing
Tight Corners ≤ 90°
Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.
Washing
Tightly Packed Features
Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.
Washing
Difficult to Access Spaces
Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.
Washing
Small Features and Openings
Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.
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Root Issue
Problem
Why Defect Presents
Design
Blind Holes
Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.
Design
Tight Corners ≤ 90°
Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.
Design
Tightly Packed Features
Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.
Design
Difficult to Access Spaces
Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.
Design
Small Features and Openings
Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.
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Root Issue	Problem	Why Defect Presents
Washing	Blind Holes	Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.
Washing	Tight Corners ≤ 90°	Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.
Washing	Tightly Packed Features	Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.
Washing	Difficult to Access Spaces	Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.
Washing	Small Features and Openings	Solvent cannot effectively reach part features when the surface tension of the liquid resin is stronger than the solvent's ability to flow through the feature.

Root Issue	Problem	Why Defect Presents
Design	Blind Holes	Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.
Design	Tight Corners ≤ 90°	Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.
Design	Tightly Packed Features	Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.
Design	Difficult to Access Spaces	Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.
Design	Small Features and Openings	Tight spaces create areas where the surface tension of the liquid resin is stronger than the solvent's ability to flow through during washing.

Sagging

Scratches and Scuffs