K40 40W Laser Lens fitting ring

K40 40W Laser Lens fitting ring

thingiverse

When I got my K40 40W Chinese laser, the ZnSe lens had no support - it was just dumped in and screwed in place. As there was no support or protection the lens could easy get scratched, break or get out of focus. This thing gives the missing protection and centers the standard 18/19mm lens in the holder.

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