123 Catch

Once I got the shape, (it took me long time to wait) I started to finalize my object's shape on 123 Catch. The tool I used on the Catch to cut extra background called lasso tools. You can easily select the parts you don't want, it would turn to the red color and then right clicked and delete it. If you want a precise model, do the cut carefully and probably zoom in to cut the fine edge.

Lasso tools

Original file

Cut the background