Difference between 2 and 4 inch laser and how to change them on a Thunder Laser

The differences between a 2 and 4 inch heads, and how to change them out on your Thunder Laser
THUNDER LASER is a professional laser system manufacturer in China and supported in Canada. We always focus on bringing CO2 laser systems to both commercial distributors, small business owners and the home craftsman.
THUNDER LASER CO2 laser engraving systems can cut and engrave into wood, acrylic, plastic, cloth, ceramics, coated metals and many other materials.
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[@DwightStebner]

I was hoping you would show differance in the 2 lens

[@misohlavati]

Hello, can you tell us what is the difference in engraving? Thank you

[@DwightStebner]

nobody explains the placement of the lens and what side of the lense facws up in the holder

[@thunderlasercanada]

Hi Dwight here is an article that will help. Domed/Rounded side on top. support.thunderlaserusa.com/portal/en/kb/articles/inspecting-and-cleaning-nova-series-optics We are working on creating more thorough support articles and videos right now. Thanks for bringing this to our attention