Symptoms

The printed part is partially missing, forming cone-shaped missing.

Printed part partial missing

Possible Causes

1. The LED light power and/or exposure time is insufficient
2. The LCD screen protector film has scratches or resin residue and looks blurry
3. Resin tank film damage and/or dirt
   
4. Resin properties are not suitable
   
5. Slicing file error
   
6. The light transmittance of the LCD screen is uneven
   

To avoid printing failure caused by operational errors, please refer to Printing Tips & Cautions

Diagnostic Steps

After printing fails, clean the residue on the build platform and in the resin tank to avoid affecting the next printing and damaging the LCD screen

1. The LED light power and/or exposure time is insufficient
   Diagnosis: If the light intensity and/or exposure time is insufficient, layers will not be cured completely, as a result, the connections between layers may not be strong enough causing partial missing.
   Solution: Increase the LED light power and/or exposure time accordingly.
   
   Increase LED light power and/or exposure time

   
   
2. The LCD screen protector film has scratches or resin residue and looks blurry
   Diagnosis: The scratches or resin residue affect the passage of the UV light, and layers cannot be cured completely, as a result, the connection between layers may not be strong enough causing partial missing.
   Solution: Change the LCD protector film.
   Reference: How to change LCD screen protector film
   
3. Resin tank film damage and/or dirt
   Diagnosis: Any damage and/or dirt of the resin tank film such as scratch, clouding, deformation may block or deviate the collimated UV light, that reduce the light intensity making the layers can not be cured completely, causing partial missing.
   Solution: Make sure the resin tank film is in good condition. If there is damage, the film needs to be replaced.
   Reference article: How to change resin tank film
   
4. Resin properties are not suitable
   Diagnosis: Some cured resin cannot be separated from resin tank film during printing, and is continuously pulled, resulting in a cone-shaped missing.
   Solution: Check the shelf life of the resin and use UNIZ resin or third party validated resin by UNIZ within the warranty period for printing. Stir the resin well before printing.
   
5. Slicing file error
   
   Diagnosis: The model data error may be caused by the design or slicing software.
   
   Solution: Check the slicing file with UNIZ Dental V2, make sure all layers are well connected, without suspended layers or points.
   
   
   

   Suspended points

   
   
   
6. The light transmittance of the LCD screen is uneven
   Diagnosis: After the printer is used for several years, the light intensity and LCD screen light transmission uniformity may change, in some areas relatively with lower light intensity, layers may cannot be cured completely, resulting in partial missing.
   Solution: Validate the LCD screen light transmittance uniformity with the help of UNIZ technical personnel, if the light transmittance is not qualified, change the LCD screen.
   Reference video: How to change NBEE LCD screen

The light intensity meter is needed for the varification of the LCD screen, DO NOT stare directly at UV light with your naked eyes when verifyring. Please contact support@uniz.com for more help.

Conclusion