Recommended test
Build a symmetric profile from one guide and verify both halves before extrusion.
- Draw a center guide and edit its offset or position to a known grid value.
- Draw a simple profile on one side, select the guide as the mirror line, and mirror the profile.
- Use Offset on a rectangular loop to create a parallel boundary.
- Convert or remove the guides, confirm the intended closed region, and extrude a shallow test.
Guides
Guides are construction references rather than solid boundaries. Create and edit an offset guide when several points must align. A guide can be converted into sketch geometry, deleted individually or converted with the available bulk action.
Offset
Offset creates a parallel loop or boundary from supported geometry, including a rectangular face loop. Check whether the offset is inward or outward and whether a small value collapses narrow corners. The new lines still need a valid closed region before extrusion.
Mirror across a guide
In Grid mode, select a guide as the mirror line, then mirror the chosen or current sketch geometry. Confirm the copy lands on the opposite side and shares intended endpoints at the center. Do not assume visually symmetric source geometry is mathematically joined.
Clean after verification
Keep helpers while editing dimensions. After the profile extrudes correctly, remove unused guides and construction lines so future selections are unambiguous. If the guide defines an important centerline, preserve it until all mirrored placement work is complete.