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Do you know the difference between Raycus lasers QS, Q, QE and QB?

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Fiber laser Laser engraving machine is becoming more and more popular. And the prices also keep reducing. Do you ever think about why the price keeps reducing? On the one hand, along with technology development, and the laser source is the core part of the fiber laser engraving machine, more and more laser source suppliers have the ability to produce laser sources by themselves. Several laser source brand competition, then the laser source price is going down. Then cause the machine price to go down.  Today we only talk about Raycus laser source. Raycus brand laser source now is famous in the world. But Raycus laser source has many series, different series different prices. Did you ever have confusion about Raycus QE series, Q series, QB series and QS series? If yes, so let's figure it out. I made a chart. This chart only talks Raycus Q switched laser source. Power QS QE Q QB 20W √ √ √ 30W √ √ √ 50W √ 100W √ As we can see, 20W has QS, QE, and QB series; 30W has QS, Q, and QB serie...