Laser Engraver Forum

As we know, the metal RF tube for 3D dynamic laser marking machine popular, it can cutting large size for paper, leather, wood, jeans. But metal tube, especially coherent, SYNRAD brand very expesnive. So the glass tube more economic for most for customer. But whats the cutting effect of the glass tube? is that fast speed, and is with big spot size?
Check the hitec co2 laser marking machine with glass tube http://www.hiteccnc.com/co2-laser-marki ... 132-1.html