Still looking for the best solution available to update a K40.

Lasers
,
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Still looking for the best solution available to update a K40.

http://smoothieware.org/smoothieboard
If hardware is one thing, what about matching software ?

+Thomas Sanladerer , +Arthur Wolf
http://www.youtube.com/watch?v=vsu_vAKvRO0

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About software for a laser cutter, you pretty much treat it like a CNC mill with a very thin tool, so any CNC mill/router G-code generator will work fine. Open-Source options include Freecad, Heekscad, Gcodetools. I personally use Cambam ( it’s cheap but not free ).
Then once you have your G-code, to control it it’s the same as with a 3D printer : Pronterface, Octoprint, etc …
If you need to generate G-code for engraving you can use this : http://fablabo.net/wiki/Raster2Gcode

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Oh and this too : http://fablabo.net/wiki/Laserengraver