Does anybody know if this will fit a K40?
73 cm too long, doesn’t fit in
Ahh, thats a shame
http://www.ebay.co.uk/itm/40W-CO2-Laser-Tube-Engraver-cutter-Water-Cool-700mm-Shenhui-K40-/321882425353?hash=item4af1b00809:g:zLwAAMXQlgtRuGGK This one is probably the correct one but £31 dearer 
Hard a word with he ebay seller and they say that it will fit into a k40 like shown in the photo, don’t know whether to opt for it or not?
Light http://object.com has an extension casing for the 40-45w tube.