Check the file before you trust it with a print

Most failed prints are diagnosed after the fact. A mesh check takes about a minute and catches the expensive failures — missing walls, hollow patches, infill in the wrong place — before the printer is committed to a long job.

Why it happens

Slicers are forgiving: they will happily slice geometry that has small holes or a few non-manifold edges, and the damage only shows up as a wall that stops halfway. Large models and multi-part assemblies are where it bites hardest, because one bad part ruins the plate.

How to fix it (about 30 seconds)

1. Drop the .3mf into the Ferdelance checker before you slice. Inspection is free and unlimited, and the file never leaves your computer.
2. Look at the two counts that matter: non-manifold edges (red) and open boundaries (amber). Zero of each means the mesh is solid.
3. If either is non-zero, run Auto-Repair and check the counts again — the tool re-verifies after the repair rather than assuming it worked.
4. Export, open in your slicer, and slice as normal. On a multi-colour model, confirm your paint is still there: Ferdelance carries AMS data through every step.

More fix guides

• How to fix non-manifold edges
• Your 3MF isn’t watertight — here’s the fix
• Fix holes and missing faces in your model
• Repair a 3MF without losing your AMS colors
• Free STL repair that never uploads your file
• Your 3MF won't open in Bambu Studio
• Clearing a non-manifold warning in OrcaSlicer
• Bambu Studio on Mac has no Fix Model
• Manifold, watertight, and what the slicer is really checking
• 3MF vs STL — what changes when you export