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Replacing a cheap Chinese CO2 Laser Tube | MCU on Eclipse
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K40 Laserröhre negativer differentieller Widerstand – Ingenieurbüro Dipl.-Ing. Harald Noack
40W Co2 Laser Tube Length 700MM Glass Laser Lamp for Co2 Laser Engraving Cutting Machine K40 Series High Quality|Woodworking Machinery Parts| - AliExpress
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Replacing the K40 tube (want to make sure I'm getting the right thing/right size) - Discussion - Maker Forums