Laser Cut
 |
| Go to modify > change parameters menu |
| Set the variable/parameter in the paramater table |
| Name your measurement(eg, length). Select the unit, and the value you want to set |
| Start sketch, using the parameters you set for the value respectively |
| When drawing the side, you can use the collinear to make sure its alige exactly. |
| Select both front and side, and cut it using the combine tool |
| Create a mid plane and mirror the two objects |
| And you get the box |