To Change Seam Settings
1. Click > > 
Model Properties. The Model Properties dialog box opens.
Model Properties. The Model Properties dialog box opens.2. Under Sheetmetal, click change in the Seam line. The Sheetmetal Preferences dialog box opens.
3. Click Seam.
4. To change the value of the gap setting, type a new value in the box or select one of the following options from the list:
◦ Thickness—Uses a default radius equal to the thickness of the sheet metal wall.
◦ 0.5 * Thickness—Uses a default radius equal to half the thickness of the sheet metal wall.
◦ 2.0 * Thickness—Uses a default radius equal to twice the thickness of the sheet metal wall.
◦ Gap—Uses a default radius equal to the value set for the SMT_GAP parameter.
5. To change the seam type, select a different type from the list:
◦ Open—Creates an open edge rip.
 | An open type of edge rip is applicable only for a concave vertex. |
◦ Gap—Creates a gap along the edge rip according to a specified dimension.
◦ Blind—Creates a blind edge rip according to a specified dimension.
◦ Overlap—Creates an overlapping edge rip.
6. To change the seam width, type a new value in the box or select Gap to create the corner treatment with a width equal to the value set for the SMT_GAP parameter.
7. Click OK. The model regenerates using the new settings.