HomeBrandsFormlabsProfessional Resin 3D Printers131
F
131
Moderate
Formlabs · Professional Resin 3D Printers
Optic Path Obstruction - Object Blocking Laser or Light Path
Quick Answer
Error code 131 on your Formlabs Professional Resin 3D Printers means: Optic Path Obstruction - Object Blocking Laser or Light Path. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Form 3+Form 3BLForm 3LForm 4Form 4BFuse 1+
Likely Causes
  1. Cured resin fragment has fallen onto the optical window or inside the light path chamber
  2. Resin tank film has delaminated and is hanging into the optical path
  3. Internal component has shifted and is partially blocking the laser or LED array
  4. Debris from a failed print has contaminated the optical assembly
How to Fix It
1
Remove the resin tank and inspect the optical window area for visible obstructions
2
Check the underside of the resin tank for any delaminating film or debris
3
If the obstruction is on the optical window, clean it with PEC pads and isopropyl alcohol
4
If the obstruction appears to be internal to the printer optics assembly, do not attempt to disassemble; contact Formlabs support
5
Run the optical diagnostics from Settings > Diagnostics to get a detailed error report for Formlabs support
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
PEC pads for optical cleaning
Replacement resin tank (if film is delaminating)
Professional optical cleaning service from Formlabs (if internal contamination)
Related Error Codes
100101102110111
Video Guides
Loading video guides…
Search more on YouTube →