--- title: Salt Baked Into Part slug: troubleshooting/salt-baked-into-part description: Discover effective solutions for addressing the "Salt Baked Into Part" part defect from Carbon DLS printing. This comprehensive document explains how to identify, troubleshoot, and understand the root causes. docTags: createdAt: 2024-06-14T00:58:25.879Z --- ::::VerticalSplit{layout="left"} :::VerticalSplitItem **Salt Baked Into Part** Salt remains stuck on parts after they have been rinsed with water post-cure. ::: :::VerticalSplitItem ::Image[]{src="https://api.archbee.com/api/optimize/3CesIL2dYMCHPZvRjp8S0/fFUO4g26naOjc0mLRgBMK_image.png" size="70" width="1080" height="1080" position="center" alt="Salt Baked Into Part" showCaption="false"} ::: :::: # 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 :::hint{type="info"} This defect is related to the [Excess Resin](docId\:yrPf8M5sTjm3dFCE-WwKX) defect, which stems from the same issue but manifests differently. ::: ::::LinkArray :::LinkArrayItem{headerType="IMAGE" headerImage="https://api.archbee.com/api/optimize/Nvx7WdIjE2XFpMaBlbCES-qUa_Nr1DQfrpv9AUZVc7v-20240812-174430.png"} **Cause **- Inconclusive ::: :::LinkArrayItem{headerType="IMAGE" headerImage="https://api.archbee.com/api/optimize/Nvx7WdIjE2XFpMaBlbCES-7KD2CVb3n7Asgki7g_0c_-20240812-174440.png"} **Cause **- Inconclusive ::: :::LinkArrayItem{headerType="IMAGE" headerImage="https://api.archbee.com/api/optimize/Nvx7WdIjE2XFpMaBlbCES-ErIdcekFPMWOj2-zNLfcI-20240812-174447.png"} **Cause **- Inconclusive ::: :::LinkArrayItem{headerType="IMAGE" headerImage="https://api.archbee.com/api/optimize/Nvx7WdIjE2XFpMaBlbCES-De4D2CmfCa1PTCSvRKV2S-20240812-174517.png"} **Cause **- Inconclusive ::: :::LinkArrayItem{headerType="IMAGE" headerImage="https://api.archbee.com/api/optimize/Nvx7WdIjE2XFpMaBlbCES-luq3PSX9Q7jzedWHRihmw-20240812-174528.png"} **Cause **- Inconclusive ::: :::: # Troubleshooting :::hint{type="info"} It is recommended that you review all the possible solutions before taking action to ensure you are pursuing the best course of action. ::: If the best course of action is not apparent, try the troubleshooting options in the order listed. Refer [here](docId\:pPm8gmeGCY_0fkFwgTCyj) for more tips. ## 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. :::ExpandableHeading{isOpen="true"} ### Washing - Touchup Touch up parts with additional cleaning to remove resin (shiny areas) - Use lint-free wipes - Use swabs - Use compressed air cabinet ![Touch-up Methods](https://res.cloudinary.com/carbon3d/image/upload/Education/Process/Orientation-Supports/Cost-Post-processing/Touch-Up-Gif_v0501-downsize-only_300px-12x.gif) Reference [Washing](docId\:AvN2rNsLSHhmUz9rbYkmN) for more information. ::: ## 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. :::ExpandableHeading ### Design 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 ![Design](https://api.archbee.com/api/optimize/3CesIL2dYMCHPZvRjp8S0/iw7ncTGGDq7a3ztUWrYMM_image.png) ::: :::hint{type="info"} If problems persist, please reach out to [Carbon Support](mailto\:support@carbon3d.com). ::: # 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](docId:7NE6rGdaSzpAPOHH5QOzm), 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](docId\:qsOQBEdCnaBfdx656tlY6) for more information. **Blind Hole Example** This example shows a blind hole **without drainage** and **with a drain hole**. The blind hole with a drain hole at the base of the feature allows resin to wash out of the feature with solvent. With a swab, you can see that the blind hole retains liquid resin after washing while the drained hole comes out clean. ![Blind Hole Example](https://api.archbee.com/api/optimize/3CesIL2dYMCHPZvRjp8S0/Nl21iIlLybwCYobB54QK5_dkk9o0u9b5zupxqb-ull8aentfek05ejj.gif) ## Causes ### Post-Processing ::::VerticalSplit{layout="middle"} :::VerticalSplitItem How the part is **handled** in post-processing is causing the defect. ::: :::VerticalSplitItem ![Post-Processing](https://api.archbee.com/api/optimize/3CesIL2dYMCHPZvRjp8S0/L8qIt6vOxrll63alqGpyY_image.png) ::: :::: | 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. | ### Print Plan Adjustments ::::VerticalSplit{layout="middle"} :::VerticalSplitItem ![Print Plan Adjustments](https://api.archbee.com/api/optimize/3CesIL2dYMCHPZvRjp8S0/BzaP59syjyUMWREOHSLmE_print-plan-adjustments-v142.png) ::: :::VerticalSplitItem [Print Plan Adjustments](docId\:NxUK0dltz_vemEAU0DIpN) adjust the print plan to optimize mid to high volume production and/or address part defects. In doing so, adjustment may both **prevent or cause defects**. Below are adjustments that can cause this defect. ::: :::: | 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. |