I can't seem to find the link that someone supplied a week or so

Lasers
,
1

I can’t seem to find the link that someone supplied a week or so ago to the metal air assist head and appropriate focal lens for it. Can someone supply a link of a unit proven to work

2

Metal air assist head
http://www.lightobject.com/18mm-Laser-head-w-air-assisted-Ideal-for-K40-machine-P701.aspx

Focusing lens
http://www.lightobject.com/High-quality-18mm-ZnSe-Focus-lens-F508mm-P670.aspx

3

You might also be referring to the Ebay Saite_Cutter head (http://www.ebay.com/itm/CO2-K40-Laser-Stamp-Engraver-Head-Mirror-20mm-Focus-Lens-18mm-Integrative-Mount-/252303388050?hash=item3abe742d92:g:kagAAOSwIrNWFIY7)

I have both but ended up using the LO one (no real reason except I got the lens & mirror from them so figured I wanted it all from the same folks if I had a problem). The Saite has the advantage of being height adjustable though.