I would strongly recomend you do not get a Chinese machine - that is unless you desire the students to learn everything about a laser (everything from how to re-tap threads to getting the computer and machine to comunicate) and not just Cad/cam tech.
I am with Rodney (and Dave S in a previous post) that saftey is insuficient for this audience.
kind regards,
John
60w EFI 6090 & 100w Z4 Reci 6090 G Weike Lasers, 4 X 4 CNC Router
CLTT using Oki C822dn & Adkins Press
Glass Sandblasting, Woodwork Shop, etc...
V Carve Pro v8 & Photo V Carve, Lasercut 5.3, Corel Draw 2017 on Windows 7 and iMac (via Parallels), etc