Hi All

I have been asked to 3d print at set of parts to make a model of a steam engine
We have been put in touch with a chap who has done an animation of the engine in Autocad 3ds and he can only export the parts as dwf files.
He has found someone to convert them into dwg files which open in autocad as a wire frame but I can not convert to a solid I just get Object cannot be converted
I am ok with 2d cad but am very new to 3d and am needing some help