HMS 0C00-0200-0002-0003: Laser Not Bright Enough
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HMS 0C00-0200-0002-0003 means laser not bright enough: the line is there but weaker than the machine expects. Obstruction is the first candidate and a tiring diode the last, because almost everything in between is something sitting in the beam path.
Bambu puts obstruction first in these messages consistently, and consistently that is where the fault turns out to be.
Where to buy
Look along the whole path, not just the window
Purge strands, a label, a cable that has migrated, a film of condensed plasticiser on a panel. Anything in the path dims the line, and the window itself is only the first inch of that path. A laser that is covered rather than dim reports as HMS 0C00-0200-0002-0006.
Wipe the optic with the right cloth
A microfiber cloth made for optics lifts haze without dragging grit, and it is worth keeping one that has never touched a build plate. A cloth that has wiped release agent off a plate carries exactly what you do not want on an optic.
Then get light on the problem
You cannot find an obstruction you cannot see. A bright rechargeable work light held at a shallow angle shows dust films and strands that vanish under the machine’s own lighting, which is aimed for the camera rather than for you.
Blow the chamber out before you reassemble
Whatever you dislodge needs to leave rather than settle somewhere else. An electric air duster moves it out without propellant, and the absence of a can means you are not spraying liquid into a machine you just cleaned.
What HMS 0C00-0200-0002-0003 shares with its neighbours
A probe that is not lit at all gives HMS 0C00-0200-0001-0001 and a vertical laser with the same complaint gives HMS 0C00-0200-0002-0007. All of them name covering or obstruction before wiring, and so should you.
How it differs from a wide line
This one is about energy; HMS 0C00-0200-0002-0002 is about focus. A dim narrow line and a bright wide line have nothing in common except that neither is measurable.
HMS 0C00-0200-0002-0003 FAQ
Is my diode dying?
Possibly, but check the path first. Obstruction outnumbers diode failure heavily.
Can I increase the power?
No, and you would be compensating for dirt rather than fixing it.
Does ambient light affect it?
Bright sun across the bed reduces contrast and can make a healthy line read as weak.
Which cloth should I use?
An optics microfiber that has never touched a build plate.
Obstruction is one failure mode; interference is another. HMS 0300-1B00-0001-0002 reports disturbance on the heatbed acceleration sensor and points at the signal wire, not the sensor.
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