The laser side of things is actually two parts. I took advice from some members in this community and also contacted a couple of experts at the manufacturers factories. What I did was make my own beam enclosure tubes but bought brand new optics - a corner mirror and a 2.5 FL Gasjet Manifold. Those cost about $1100. I bought a newly reconditioned laser from the manufacturer with a 90 day warranty for another $1000. I did not get a collimator, or a red dot diode pointer which would be another $2000. I have a work around that involves a couple of steps in setting uip the tool and that's it.
Two things I was told repeatedly by the experts - don't skimp on the optics and keep them clean. Also, keep your laser horizontal - don't be tempted to mount it vertically on the Z axis gantry to save money.
My gas purge system ensures that at no time does any of the pyro gases get to the lenses or drift up the tube to the laser mirror or beam bender. I blow CDA over all three areas while using the machine and after now many noxious material cuts I have examined the mirror and lenses and they remain clear and unclouded. Not a hint of contamination.
I've chosen to listen to the experts and am rewarded with a very nice tool and you will too if you choose to go this path.  |