The cheap lenses do not engrave etc as well as the OEM expensive ones..ours in a VERY harsh environment last about 6 months , but at the price , they are considered consumables .. we have 9 lasers running almost continually , 8 of them use lenses .. so we keep quite a few in stock
OEM lenses last a lot longer.. 2 years sometimes , but despite training my operators re cleaning , its pretty rough and ready (spit and the corner of a shirt) , so we hae moved over to the cheapy lenses for general work
Rodney Gold, Toker Bros trophies, Cape Town , South Africa :
Roland 2300 rotary . 3 x ISEL's ..1m x 500mm CnC .
Tekcel 1200x2400 router , 900 x 600 60w Shenui laser , 1200 x 800 80w Reci tube Shenhui Laser
6 x longtai lasers 400x600 60w , 1 x longtai 20w fiber
2x Gravo manual engravers , Roland 540 large format printer/cutter. CLTT setup
1600mm hot and cold laminator , 3x Dopag resin dispensers , sandblasting setup, acid etcher