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IR Sensor Sometimes Triggers Too Early
ryanh1904
Posts: 4Member
Has anyone else had/solved the issue where the IR sensor sometimes triggers several mm too high when homing. It then tries to bed level and fails because it incorrectly sensed z home as much higher. I'm assuming this is to prevent damage.
This problem usually happens when beginning a new print after I have completed a print with at least 5-10 mm z height. Manually lowering the z height before beginning a print resolves the problem temporarily.
In testing the ir probe, I notice that the indicator light triggers at the proper location and triggers with a dimmer and more sporadic light at a much further distance.
This problem didn't exist for the first several months of using the IR sensor and only cropped up recently.
Sensing at incorrect location:
Sensing at correct location. Note the brighter indicator light.
This problem usually happens when beginning a new print after I have completed a print with at least 5-10 mm z height. Manually lowering the z height before beginning a print resolves the problem temporarily.
In testing the ir probe, I notice that the indicator light triggers at the proper location and triggers with a dimmer and more sporadic light at a much further distance.
This problem didn't exist for the first several months of using the IR sensor and only cropped up recently.
Sensing at incorrect location:
Sensing at correct location. Note the brighter indicator light.
Comments
That IR probes never work well, I had that probe to.
Alone the design of it is stupid, who places the ELKO directly on the lowest and hottest place? That Elko doesnt hold up for a long time.
Not personally had that. The whole point of the circuitry is that it decidedly latches On or Off, not half on (the dim LED state you're seeing).
As Der_Muck says, the design is a little flawed, the capacitor is 105 degrees c rated and sits a few mm above a 100c + heated bed and a 240c nozzle. Its likely your capacitor has failed/is failing. Grab another module, swap it out and you'll probably be fine.
Interestingly, the capacitor is put there for a reason. It blocks light from shining directly from the IR emitter to the receivers and saves the designer from having to use something else like a raised PCB section to do the same thing. Great in theory, but bad in practice for the reasons mentioned above.
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