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Common Defects in UV 3D Printing (Part 6)

Release time:

2026-07-25 23:42

Common Defects in UV 3D Printing (Part 6)

Among the various defects in UV‑based 3D printing, equipment condition and environmental factors are often overlooked yet have a profound impact. Degradation of the release film can lead to difficult demolding, delamination, or even print failure; screen malfunctions may cause localized curing anomalies or voids in the model; and excessively low temperatures can impair resin flow and compromise curing performance. A common characteristic of these issues is that they do not stem directly from model design or slicing parameters, but are closely tied to equipment maintenance and the operating environment. Understanding the manifestations and root causes of equipment‑ and environment‑related defects is essential for ensuring printing stability.

I. Aging of Release Films

The release film (typically an FEP film) is a critical component at the bottom of the resin tank in equipment that employs a bottom-up exposure process, and its condition directly affects the smoothness of the demolding operation.

Excessive use leading to wear is the primary cause of release‑film aging. As the number of print cycles increases, the surface of the release film gradually becomes rougher, losing its original smoothness, and separation from the cured layer becomes more difficult. Once worn, the release film increases the pulling force on the model during demolding, which may result in the cured layer adhering to the film and becoming difficult to peel off, or it may trigger interlayer delamination.

Surface contaminants and scratches both degrade print quality. Contaminants on the release film can block UV transmission, leading to insufficient resin curing in the affected areas and resulting in surface defects. Scratches, meanwhile, can act as stress concentrators, causing the model to tear or the film itself to rupture during demolding. Improper handling during cleaning can also easily scratch the release‑film surface.

II. Screen Malfunction

The LCD screen or DMD chip is the optical core of a light-curing 3D printer, and its operational condition directly affects the clarity of the cured pattern.

Dead‑pixel defects manifest as persistent bright or dark spots on the screen. A bright‑pixel defect allows light to pass through continuously at that location, leading to the formation of excess cured resin fragments on the release film or the creation of unwanted cured layers at the base of the model. Conversely, a dark‑pixel defect blocks light entirely, preventing the resin in the corresponding area from curing and resulting in voids or missing details on the model’s surface.

A decline in transmittance is a common sign of screen aging. Under prolonged exposure to ultraviolet light, the liquid crystal material or polarizing film gradually degrades, resulting in reduced transmittance. Even when the light source delivers normal energy, insufficient effective photon flux reaches the resin surface, leading to inadequate curing in those areas and a corresponding reduction in model strength.

High-temperature damage is an accelerating factor in screen failures. During printing, the screen absorbs a portion of the ultraviolet energy and converts it into heat; if heat dissipation is inadequate, the screen temperature will continue to rise, potentially causing damage to the liquid crystal material. Under brief exposure to high temperatures, the screen may exhibit reversible display anomalies, but sustained high temperatures can lead to irreversible damage.

III. Temperature Too Low

The ambient temperature during printing directly affects the resin’s state and the curing process.

The primary effect of excessively low temperatures is an increase in resin viscosity. When the temperature drops below 20°C, the viscosity of photosensitive resin rises markedly, reducing its flowability and making it difficult to evenly coat the cured surface after each layer has been solidified, which may result in material shortages or poor interlayer adhesion.

The decline in the curing reaction rate is also attributable to low temperatures. Photopolymerization is a chemical reaction whose rate is significantly influenced by temperature. At excessively low temperatures, even with sufficient exposure time, the resin’s conversion rate may fail to reach the desired level, resulting in incomplete curing or diminished mechanical properties. Certain resins struggle to cure and form properly when exposed to environments below 15°C.

Bubble entrapment becomes more pronounced at low temperatures. In high-viscosity resins, bubbles are expelled more slowly and are more likely to remain trapped within the resin, leading to bubble‑related defects during printing.

IV. Conclusion

Equipment‑ and environment‑related defects are often overlooked in UV 3D printing, yet they can have a significant impact. Degradation of the release film can lead to demolding difficulties, delamination, and print failures, necessitating regular inspection and replacement; screen malfunctions may cause localized curing anomalies or voids in the printed part, requiring attention to heat dissipation and component lifespan; and excessively low temperatures can impair resin flow and curing performance, so ambient temperature should be maintained within an appropriate range. When troubleshooting, begin with equipment maintenance by establishing a routine schedule for inspecting and replacing the release film and screen; then optimize the printing environment to ensure suitable temperature conditions and avoid direct sunlight. Sound equipment maintenance and environmental control form the essential foundation for ensuring printing stability and success rates.

Disclaimer: The above content has been compiled from publicly available sources and is provided for reference only. If any infringement occurs, please contact us, and we will address it promptly.

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Common Defects in UV 3D Printing (Part 7)

Common Defects in UV 3D Printing (Part 5)