Overview

Failed prints typically fall into two categories: nothing forms on the build platform, or the print is partially printed with parts missing. Both issues usually result from resin contamination, an obstructed optical path, or model setup problems. This guide covers the essential checks to perform after any failed print on Pro, Pro S, or Pro 2, and includes model-specific considerations where applicable.

1. Before Proceeding: Clean the Resin Tank

After any failed print, the first step is to inspect and clean the resin tank.

• Stir the resin using the silicone spatula included with your printer.
• If the spatula catches on hardened resin or you see partially cured pieces, remove them immediately.
• Do not attempt another print until all cured debris is removed.
• Trying to print over contaminated resin often leads to repeated adhesion failures and damage to the resin tank.

Small cured particles left in the tank are a leading cause of:

• Adhesion failures
• Partial prints
• Cracking
• Surface artifacts

For full instructions, refer to:
Resin Tank Maintenance
 

2. Clean the Optical Path

Adhesion depends on uninterrupted light passing through the optical components. Any contamination can prevent proper curing of initial layers.

The optical path includes:

• The printer’s optical glass (location varies by model)
• The resin tank film, which acts as part of the optical window

Both surfaces must be completely clean and free of resin, dust, and fingerprints.

Model-Specific Notes

• Pro / Pro S: Clean the projector glass on the bottom of the printer and the underside of the resin tank.
• Pro 2: Clean the Optical Panel and resin tank film.
  See: Pro 2: Optical Panel

After cleaning both components, run a small test print to confirm improved adhesion.
 

3. Check Your Print Setup

Print Setup automatically scans for model issues that can prevent proper curing.

• Import your STL or Cloud Design file into Print Setup.
• The system will highlight geometry or mesh problems in red.
• Fix or regenerate any models with errors before sending the job to your printer.

Mesh defects, broken surfaces, or inverted normals can all cause first-layer failures.

Each resin has a dedicated profile in Print Setup.

Using the wrong resin profile can cause:

• Poor adhesion
• Cracking
• Incomplete curing
• Layer artifacts

Confirm that the selected resin profile matches the material currently installed in the tank.
 

4. Check Supports (If Needed)

For prints that require supports, improper support structure can cause early detachment.

Use Automatic Supports in Print Setup unless your workflow requires custom supports.

Supports are recommended when:

• The model lacks a flat base
• The model includes overhangs
• The model is hollow
• You are printing restorations, appliances, hybrid dentures, guides, or other non-flat geometries

Insufficient support density or incorrect orientation is a leading cause of prints detaching during the first layers.

5. Surface Artifacts (Horizontal or Vertical Lines)

If prints show visible lines:

1. Inspect the STL file to confirm the lines are not part of the model.
2. Clean the optical path thoroughly.
3. Confirm correct resin profile.
4. Reprint and compare.

Lines that are not present in the file are typically caused by contamination or improper exposure settings.
 

When to Contact Support

If prints continue failing to adhere after completing all steps above:

• Inspect the resin tank for signs of wear (wrinkles, haze, damaged film)
• Check for visible scratches or contamination on optical components
• Try a known, validated print file (such as a calibration object)
• Test using a new resin tank if available

Contact Support Here