---
title: Blow Out
slug: troubleshooting/blow-out
description: Discover effective solutions for addressing the "Blow Out" part defect from Carbon DLS printing. This comprehensive document explains how to identify, troubleshoot, and understand the root causes.
docTags:
createdAt: 2024-06-14T01:05:41.675Z
---
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**Blow Out**
An unvented volume creates its own vent hole under the pressure differential.
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# How to Identify
Blow out can be diagnosed as follows:
- Blow out is a defect specific to unvented volumes.
- The hole will generally appear along a [Vacuum Line](docId\:uIA3VrtjsNOqvyXwL8VxS), horizontal relative to the platform.
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**Cause** - **Unvented Volume**
**Solution** - Print Preparation or Part Design
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**Cause** - **Unvented Volume**
**Solution** - Print Preparation or Part Design
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**Cause** - **Unvented Volume**
**Solution** - Print Preparation or Part Design
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# Troubleshooting
Verify if your project contains an unvented volume.
- [Project Analysis](docId\:gfR-GoC-Irq_L9_KanC-X) in the printer software will alert you if you have an unvented volume.
- If you do have an unvented volume, proceed to the **Print Preparation or Part Design Adjustments** troubleshooting options below.
- If you do not have an unvented volume, refer to the **Identify a Defect** guide to identify a different defect.
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It is recommended that you review all the possible solutions before taking action to ensure you are pursuing the best course of action.
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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.
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### Orientation
- **Unvented volume**
- Reorient the part to vent the trapped volume (supports may also be needed)
### Supports
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### Supports
- **Unvented volume**
- Lift the part above the platform on supports to vent the trapped volume
- Use bar supports, or break up fence supports into shorter sections with gaps in between, to provide venting
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### Design
**Unvented volume**
- Add vent holes in the part, near the platform, to vent the trapped volume
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Reference [DLS Design Guidelines](docId\:t94PR-A-C0pIhY6LJsWk7) for vent hole guidance.
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### Print Plan Adjustments
[Print Plan Adjustments](docId\:NxUK0dltz_vemEAU0DIpN) are not applicable for this defect.
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If problems persist, please reach out to [Carbon Support](mailto\:support@carbon3d.com).
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# Explanation & Causes
## Explanation
An [unvented volume](docId\:U7XYytjyDp3BvsYy2qKcU) has a pressure differential inside versus outside the trapped volume. If an internal cavity cannot vent to the outside, the difference in pressure between the inner cavity and the outside of the part can cause the part to puncture, creating its own vent hole.
- Thin walls in conjunction with a large trapped volume are the most likely to experience a blow out.
- More susceptible to unvented volumes:
- EPU due to its low green strength.
- L1 printer due to larger suction forces.
## Causes
### Print Preparation or Part Design
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How the part is **oriented**, **supported**, or **designed **is causing the defect.
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| **Root Issue** | **Problem** | **Why Defect Presents** |
| --------------- | ------------------- | ---------------------------------------------------------------------------------- |
| Unvented volume | A hole in the part. | The pressure differential causes the part to puncture, creating its own vent hole. |