Four load modes, four different relationships to layer direction
Tension, bending, compression, and torsion each interact with an FDM part's layered structure differently. Tension and the tension side of bending both rely on interlayer adhesion if the layers run across the load, generally the weakest link in a printed part. Compression loads the cross-section more evenly and is comparatively forgiving of layer direction. Torsion is the hardest case: the shear it creates runs diagonally, so no single orientation choice fully avoids crossing it. This tool explains which of these four relationships applies to your part, without ever converting that explanation into a fake capacity number.
How the review works
Your selected load mode determines which explanation applies, and whether your stated layer alignment elevates risk. Compression is treated as comparatively low-risk regardless of alignment; torsion is flagged as elevated risk regardless of alignment, since no orientation fully solves it; tension and bending are flagged as elevated specifically when layers run across the load. Wall count and your own stated test importance shape the accompanying recommendation.
Worked example
A tension-loaded bracket with layers running across the load (not aligned), 3 walls, medium test importance: the tool flags elevated risk, explains that the tension load relies on interlayer adhesion in this orientation, and recommends reading the Strength-Axis Orientation Planner's reorientation option alongside increasing wall count as a general hedge.
A common mistake
A frequent error is analyzing load direction for the part's obvious, intended use while ignoring how it will actually be handled, dropped, or stressed during installation or misuse. A bracket designed only for its steady-state tension load can still see an unplanned bending or impact moment while being installed; consider the full handling life, not just the designed load case.
Limitations
This explains layer-direction and geometry risk qualitatively; it does not rate load capacity, calculate a safe load, or replace a real strength test. Torsion in particular deserves the most caution, since orientation alone cannot fully resolve it.