Fringing
Fringing
Resin is still moving when curing, resulting in excess partially-cured resin on the surface or outer edges of the part.
Fringing can be diagnosed as follows:
- After printing
- The excess partially-cured resin on the part may appear wet & shiny like liquid resin, but it will not wash off the surface, even with manual touch-up.
- On Surfaces
- Excess resin sits proud of the correct surface.
- The texture may appear fuzzy, bumpy, and/or shiny.
- The texture will run horizontally relative to the build platform.
- The texture will run around the entire perimeter of the part.
- On Edges
- Fringing on edges usually occurs at the base of the part (at the platform), especially at large cross sections.
- On the exterior edges of a base, fringing will appear jagged. Flashing is a defect that may appear similar but will be smooth instead of jagged.
- Where a lattice connects to a base, the lattice struts will appear disconnected to the base.
Cause - Unvented Volume
Solution - Print Preparation or Part Design
Fringing on surface
Cause - Unvented Volume
Solution - Print Preparation or Part Design
Fringing on surface
Cause - Unvented Volume
Solution - Print Preparation or Part Design
Fringing on surface
Cause - Unvented Volume
Solution - Print Preparation or Part Design
Fringing on surface
Cause - Unvented Volume
Solution - Print Preparation or Part Design
Fringing on surface
Cause - Large Cross Section
Solution - Print Preparation or Part Design
Fringing on surface
Cause - Inconclusive
Fringing at base edge
Cause - Inconclusive
Fringing at lattice strut connected to base
Cause - Inconclusive
Fringing at lattice strut connected to base
If any of these conditions apply to your print, take the corrective action and reprint to see if the problem is resolved.
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.
If problems persist, please reach out to Carbon Support.
Fringing occurs when resin is still moving when the UV light begins to cure the slice. Resin can be continuing to flow for a couple reasons.
- There simply has not been enough time in the settle down stage of printing for the resin to stop moving. This can be due to a mis-selected resin, large cross section, or a print that has been sped up too much.
- An unvented volume can cause the resin to flow abnormally from the pressure differential inside versus outside the trapped volume, and in some cases, the walls of the part itself are moving under the pressure of the unvented volume.
- More susceptible to unvented volumes:
- EPU due to its low green strength.
- L1 printer due to larger suction forces.
Root Issue | Problem | Why Defect Presents |
|---|---|---|
Large cross section | Fringing occurs on the surface around a large cross section. | The resin needs more time to flow across larger cross sections. |
Large cross section | Fringing occurs on the edges of a base. | The resin needs more time to flow across larger cross sections. |
Large cross section | A lattice appears disconnected from a base. | The resin effectively did not fully cure as it was still moving along the base, appearing as though the struts did not fully connect. |
Unvented volume | Fringing occurs on the surface around an unvented volume. | Resin is still moving from the pressure differential, which can even make the walls of the unvented move in extreme cases. |
Root Issue | Problem | Why Defect Presents |
|---|---|---|
Incorrect resin | The resin selected in the project was not the same as the resin printed. | The print plan determines how long the settle down phase will last, and the resin is one of the factors in that determination. If the wrong resin is selected or printed, then the print plan may not have the timing right. |
Printing Stage | Parameter Type | Type of Adjustment | Why Defect Presents |
|---|---|---|---|
4 Settle Down | Delay Timing | Decrease | The resin needs more time to stop flowing. |