Hi, Clive
LazyCam is for converting 2d dxf into 2.5d g-code format not true 3d, Pocketing, Offsetting, Hole drilling and such, It's Lazy.
Mach3 will load 3d G-code generated by a cad-cam package with the proper post, Have you checked if theres a post for Mach3.
It uses allot of Funic/standard/common type g-code.
Hears a BobCad posted G-code 3d item.
Thanks, Chip