The model is designed by a very powerful 3D modelling software: ??DesignSpark Mechanical. It is Spaceclaim based and freely offered by RS-Components! The file as format-obj was also converted by DesignSpark Mechanical and also uploaded. You can download the free software from: http://www.designspark.com/mechanical Please refer to the blog: http://www.rs-online.com/designspark/electronics/chn/blog/content-812?/designspark/electronics/blog/content-812=