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My F1 xTool has been working great and only been in use for a few weeks, but today the blue laser light is no longer visible for focusing or framing.  What would have caused this?  My diode laser perfectly etched a black tumbler with the RA2 Pro Rotary Attachment, but now the blue light is no longer visible.  Any suggestions for how to fix this is greatly appreciated.  I have no way to focus or frame without the blue light.  Thank you!