Part Defects

Detached from Supports

9min

Detached from Supports
A part is partially or completely detached from its supports during printing.
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How to Identify
Detached from supports can be diagnosed as follows:
Check the build after printing.
Verify that no parts fell off supports.
Look at parts where they meet the supports and look for areas that are not connected.
Part geometry did not resolve properly
Cause - Inconclusive
Cause - Inconclusive
Cause - Under-supported
Solution - Print Preparation or Part Design
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.
Change orientations with large suction forces such that supports are carrying a lighter load
Avoid asymmetric orientations (as in the example below)
Avoid larger cross sections later in the print
Obtain a more uniform cross section throughout the print
Move the part's center of mass closer to the platform
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Unvented volume
Ensure there is enough space between supports for venting. Break up fence supports into shorter sections with gaps in between to provide venting.
Under-supported
Add more supports for stability.
Reference the stability guidelines﻿ for tips on improving stability.
Ensure support parameters are strong enough for the selected resin
Avoid keeping supports when you change a resin. The software will warn you and advise you to clear supports (and re-support the part).
Use the default tip and neck sizes for supports or increase their size when suction forces are especially high.
Reference Supports﻿ for information on editing support parameters.
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Reference Print Plan Adjustments﻿ for guidance on the following parameters:
﻿1 Pump Up Parameters﻿ 
Pump Height Parameters
Minimum Pump Height
Minimum Distance from Peak
Distance from Peak Multiplier
Platform Speed Parameters
Motor Speed U
If problems persist, please reach out to Carbon Support.
Explanation & Causes
Suction forces pulling down on the part are stronger than the provided supports can handle.
Reference DLS Printer Dynamics﻿ for more information on suction forces.
M1 and M2 printers generally require more supports than M3 and M3 Max printers because they do not have force feedback (FFB) capabilities to respond to suction forces. 
L1 printers fall in the middle because they use FFB but have larger suction forces in general due to large platforms.
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Causes
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Root Issue
Problem
Why Defect Presents
Orientation
Large cross sections later in the print
Suction forces increase later in the print from large cross sections and the supports are not strong enough to overcome the force increase. 
Orientation
Asymmetrically oriented part
Suction forces can cause torque on asymmetrically orientated parts, rotating them off their supports if under-supported.
Supports
Under-supported
The part simply does not have enough supports to withstand suction forces.
This is more common with fence supports than bar supports.
Supports
Supports generated for a different resin
Supports are resin specific, with default parameters designed for the selected resin. If the user opts to keep supports after changing the resin, the supports may no longer be strong enough to hold onto the part.
Supports
Support tip/neck parameters too small
Support parameters are editable in Carbon software. If the supports tips or neck diameter (for bar supports) are decreased from default, supports may no longer be strong enough to hold onto the part.
Unvented volume
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A vacuum in an unvented cavity exacerbates suction forces.
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Printing Stage
Parameter Type
Type of Adjustment
Why Defect Presents
1 Pump Up
Pump Height
﻿Decrease﻿
A shorter pump height can make it more difficult for the part to break free of the dead zone surface tension. If this happens, supports may not connect properly to the part.
1 Pump Up
Platform Speed
﻿Increase﻿
Increased Motor Up Speed increases suction forces
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Root Issue	Problem	Why Defect Presents
Orientation	Large cross sections later in the print	Suction forces increase later in the print from large cross sections and the supports are not strong enough to overcome the force increase.
Orientation	Asymmetrically oriented part	Suction forces can cause torque on asymmetrically orientated parts, rotating them off their supports if under-supported.
Supports	Under-supported	The part simply does not have enough supports to withstand suction forces. This is more common with fence supports than bar supports.
Supports	Supports generated for a different resin	Supports are resin specific, with default parameters designed for the selected resin. If the user opts to keep supports after changing the resin, the supports may no longer be strong enough to hold onto the part.
Supports	Support tip/neck parameters too small	Support parameters are editable in Carbon software. If the supports tips or neck diameter (for bar supports) are decreased from default, supports may no longer be strong enough to hold onto the part.
Unvented volume		A vacuum in an unvented cavity exacerbates suction forces.

Printing Stage	Parameter Type	Type of Adjustment	Why Defect Presents
1 Pump Up	Pump Height	Decrease	A shorter pump height can make it more difficult for the part to break free of the dead zone surface tension. If this happens, supports may not connect properly to the part.
1 Pump Up	Platform Speed	Increase	Increased Motor Up Speed increases suction forces

Delamination

Excess Resin