My first one was made by CD-ROM parts. With a surface of 4x4cm and laser power of 250mW it was nothing more then a toy.
My second one was built with drawers guides mounted on a wooden frame. With 25x30cm area it was a nice upgrade, but guides are not so precise, and speed was low.
I decide to upgrade it with a 2W blue laser and improve mechanic parts with self-cut support, linear bearings etc.
The actual one was born from the ashes of the previous from whom he inherited the frame and electronic parts, assembled in a nicer cleaner and more solid way.