Add additional slice to model in Solidworks

1. Open part of model if it's in assembly
2. Sketch tap -> Sketch button (3D Sketch) -> Select Line (ShortcutL)
3. Draw three lines (points) and define a plane using the points (NOT two lines)
4. To define a plane, Feature tab -> Reference Geometry -> Plane
5. Right click the created plane underFeatureManager Design Tree, select sketch
6. Select the new sketch, press Convert Entities, then select the plane we want to extrude from original model.
7. With the sketch selected, press Extruded Boss/Base button.
   • After all slices extruded, we can hide the 3D sketches for better visualization.
8. Hide other part, only leave extruded part shown. Save the extruded part as separate file with proper name (Note: usecopy and continue in save dialog).
9. Leave the part edit mode without saving or changing anything in assembly.
10. Import the saved extruded part in assembly.
11. Mate three planes (front/top/right) between extruded part and original part.

Export to mesh for colouring

1. Save as IGS (choose specified coordinate)
2. Open the IGS file, save as VRML (*.wrl) with VRML97 version which is supported by meshlab
3. Close IGS file without saving it.