very good
openBuilds FreeBURN-2-Mini V-slot CO2 Laser (40-50w)
Build in 'LASER - PLASMA BUILDS' published by openhardwarecoza, Oct 5, 2015.
A new mini version of the http://openbuilds.com/builds/openbuilds-freeburn-1-v-slot-co2-laser-60-100w.1001/ FreeBurn CO2 Lasercutter