进口造型教程（入关审批耽误了好久）

Fillet the bottom edge 2mm

Created an extruded surface with the 2D sketch that defines the material break between the two colored plastics.  
  
This will be used to split the solid body into two bodies along the character line that we defined earlier

Split the body using the extruded surfaces.
  
Pick the surface  
Cut the part
Pick the Bodies that you want to keep from the resulting bodies

Go to the Solid Bodies folder and pick the top part of the mouse and hide it

You can see the wall thickness now that you can see inside. Fillet the top edge. Fillets are cool from an engineering perspective they eliminate stress risers at sharp edges, and allow for easier ejection from tooling. Fillets also make your final renders look good because they catch light well.

Hide the bottom and fillet the edge of the top component

Create an extruded surface to split the top component again.

Split the model with the extrude. In hindsight it would have been better to combine all the splits in to one command

You can change the color properties of any object by right clicking on it and going to color

Cut extrude the opening for the mouse wheel. Offset the sketch plane from the sketch plane by about 5mm (this option can be found in the first drop down menu).