Structural safety is outside the STL.
Fix3DFile does not know the load, material, layer orientation, printer calibration, or environment of the final part.
Learn without uploading a file. These guides explain the same private inspection and repair controls used in the workspace.
Guide 02 · Repair
Choose the smallest change that solves the defect.
A repair is not good merely because the output is watertight. It also has to preserve the shape you meant to print.
Choose by intent
How much should the tool be allowed to change?
Small, traceable edits
Preserve first.
Removes exact duplicates, corrects winding, and fills repairable boundary loops. It stops when a safe local fix is not clear.
Original · brokenSafe repair
drag
Drag model to rotate · Drag divider to compare
source defectrepaired geometrylocal patch preserved
Decision path
Start conservative. Escalate only when the mesh forces you to.
- 01
Diagnose first
Use safe repair for duplicates, winding, and fillable holes. These changes can be recorded face by face.
- 02
Inspect the result
Use Changes, X-ray, and Cross-section. A green status is a geometry check—not proof of strength or print safety.
- 03
Rebuild only when necessary
Severely open, self-intersecting, or fragmented meshes may need a newly reconstructed surface.
- 04
Read deviation both ways
Rebuilt-to-original measures surface drift. Original-to-rebuilt helps detect source regions that disappeared.
Confirm size in your slicer.
STL coordinates have no built-in unit label. The dimension checker warns about suspicious scale but cannot infer intent with certainty.
Download a separate copy.
The tool does not overwrite the source file. Keep the original and compare the repaired output before printing.
Ready to inspect a real file?