I have downloaded this solidworks model : GrabCAD - CAD library
and want to separate the parts(wheels, head, body) and then change they dimensions and use some of them. But I am newbie in Solidworks and couldn't do it. when I want to move or copy for example boss-extrude3 or boss-extrude4, it says you can not select a feature!
I like to know what's the best way to resize this robot (about 4times smaller), and do some changes and then build it(3D printing).
Sorry if my question is very low level, I am a computer engineer but also love Robots!