Part Defects

Over-Adhesion

16min

Over-Adhesion
The part is difficult to remove from the platform.
﻿
﻿
How to Identify
Over-adhesion is really an experience while removing the part from the platform, rather than a defect itself. Other defects may arise as a result of the difficulty in platform removal, as shown in the examples below, or you may simply be adding time to production as the labor to remove these parts becomes a burden.
Over-adhesion can be experienced as follows: 
Parts are very difficult to remove from the platform. 
Parts exhibit Flashing﻿ where they attach to the platform.
Parts exhibit Chipping﻿ or Gouging﻿ where they meet the platform when attempting to remove.
Flashing example with parts on the platform
Chipping example during platform removal
Troubleshooting
Do you see a defect?
If you see Flashing﻿, Chipping﻿ , or Gouging﻿, refer to that defect's troubleshooting for specific guidelines.
Is the part difficult to remove without a defect?
﻿
Process 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.
For new platforms
The factory coating may make parts difficult to remove. Use acetone wipes or an acetone soaked blue towel to scrub off the coating.
For platforms that have been in production, refer to the Diagnostics section.
﻿
Release film reduces adhesion.
If you experience over-adhesion, try printing the build using release film.
﻿
Try removing parts from the platform with a dead blow hammer and scraper, when too much force is needed with the scraper tool alone:
Align the scraper blade with the part.
Tap back of the scraper tool LIGHTLY with the hammer.
Make sure to keep blade against platform at all times.
﻿
﻿
Diagnostics
If the above checks & actions did not resolve the issue or do not apply to your print, the following diagnostics may further inform what is causing the issue.
Print with a different platform
If the issue is resolved with another platform, reach out to Carbon Support for assistance with the problematic hardware.
If the issue persists with the same platform, run an Alignment Squares Test﻿.
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.
Change the orientation to place a smaller cross section on the platform.
﻿
Support the part off the platform. 
Supports will provide a smaller cross section on the platform
The scraper tool used to remove the part from the platform will not touch the part, protecting it from damage.
﻿
Redesign the part with fillets or bevels at the platform edges.
﻿
﻿Use extreme caution with this troubleshooting option.
A common cause for the inverse defect, Under-Adhesion﻿, can be from this type of design. This is best utilized for rigid resins when the cross section on the platform is large and other solutions are not viable.
Reference Print Plan Adjustments﻿ for guidance on the following parameters:
﻿5 Exposure Parameters﻿ 
To reduce adhesion
Exposure Timing Parameters
Base Exposure Multiplier
Brightlining Parameters
All four parameters must be specified
Brightline Interior Exposure Time
Brightline Exterior Exposure Time
Brightline Border Thickness Pixels
Brightline Outer Borders
If problems persist, please reach out to Carbon Support.
Explanation & Causes
Explanation
The first slices of the build are exposed to a higher level of UV light to promote adhesion. This can result in parts that are very strongly adhered to the platform.
Geometries with larger cross-sections at the platform are the most susceptible to over-adhesion.
EPX may be more prone to over-adhesion due to its rigidity.
﻿
Causes
﻿
Root Issue
Problem
Why Defect Presents
Oriented
Large cross section on the platform
More surface area to adhere the part to the platform at the higher base exposure levels.
﻿
Root Issue
Problem
Why Defect Presents
Cleaning
Factory coating on platform
The factory coating on a new platform can lead to stronger adhesion. 
Misalignment
Mechanical alignment of the printer
The platform could be too close to the window, receiving a higher dose of UV light than intended.
﻿
Printing Stage
Parameter Type
Type of Adjustment
Why Defect Presents
5 Exposure
Exposure Timing
﻿Increase﻿
Adhesion is increased with more UV exposure
5 Exposure
Brightlining
﻿Increase﻿
Adhesion is increased with more UV exposure
﻿

Root Issue	Problem	Why Defect Presents
Oriented	Large cross section on the platform	More surface area to adhere the part to the platform at the higher base exposure levels.

Root Issue	Problem	Why Defect Presents
Cleaning	Factory coating on platform	The factory coating on a new platform can lead to stronger adhesion.
Misalignment	Mechanical alignment of the printer	The platform could be too close to the window, receiving a higher dose of UV light than intended.

Printing Stage	Parameter Type	Type of Adjustment	Why Defect Presents
5 Exposure	Exposure Timing	Increase	Adhesion is increased with more UV exposure
5 Exposure	Brightlining	Increase	Adhesion is increased with more UV exposure

Looping

Overcure

Over-Adhesion

How to Identify

Troubleshooting

Do you see a defect?

Is the part difficult to remove without a defect?

Process and Hardware Checks

Platform

Release Film

Process Technique

Diagnostics

Hardware

Print Preparation or Part Design Adjustments

Orientation

Supports

Design

Print Plan Adjustments

Explanation & Causes

Explanation

Causes