Beginner3D Printing

Prepare a CAD Model for 3D Printing

Export, repair and slice an STL so the printed part matches the design intent.

Estimated completion: 30 min

Objective

Produce a watertight, correctly oriented STL and a slicing profile suited to a functional part.

1
Check wall thickness
Confirm no wall is thinner than two nozzle widths, otherwise the slicer will skip it.
2
Export with sensible tolerance
Set the chord tolerance small enough for smooth curves without producing an oversized file.
3
Repair the mesh
Run a repair pass to close holes, remove non-manifold edges and correct inverted normals.
4
Orient for strength
Rotate the part so layer lines run perpendicular to the main load direction.
5
Slice and preview
Inspect the layer preview for gaps, unnecessary supports and thin unsupported spans.

A sliced file whose preview matches the intended geometry with no missing walls.

Problem	How to fix it
Slicer reports non-manifold geometry	Repair the mesh again and re-export from CAD with a finer tolerance.
Part fails at a layer line	Reorient the part or increase perimeter count.