Unsolved Nozzle crashed into bed while homing - can this be avoided?
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I wonder if part of the issue is binding on the axis...
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@Phaedrux said in Nozzle crashed into bed while homing - can this be avoided?:
I wonder if part of the issue is binding on the axis...
I don’t think there’s any binding going on. I completely disassembled, flushed, greased and carefully assembled all the linear rails. I spent a lot of time with squares and calipers during the build and would say that the machine is very mechanically sound. That is my strong side, so I am more concerned with electronics/firmware where I am still very challenged.
I just saw the other post with @dlc60 having 45 degree layer shifts. Mine are exactly 45 deg and exactly the same direction and distance between them. I wonder if we are seeing the same thing?
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@Phaedrux
I am trying to tune some different things right now, and it just happened again
It seems completely random! This time I know for sure that the X/Y homing when fine, but still the probe did not come out, and I just managed to stop it before crashing hard..
Console says:
19.6.2020 14.55.16 Error: Z probe was not triggered during probing move Error: Z probe was not triggered during probing move Error: Homing failed -
Alright you must check your BLTouch wiring for continuity. The crimps are notorious failure points. This is by far the most likely problem at this point.
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@Phaedrux said in Nozzle crashed into bed while homing - can this be avoided?:
Alright you must check your BLTouch wiring for continuity. The crimps are notorious failure points. This is by far the most likely problem at this point.
Alright I ran through it.
I got it wired uip to IO_7
Red wire runs to 5V_EXT - Continuity, measured ~2.2 ohm
Yellow wire runs to io7.out - Continuity, measured ~2.2 ohm
Brown and black wire run to GND - Continuity, measured ~2.2 ohm
White wire runs to io7.in - Continuity, measured ~2.2 ohmEarlier today I was doing a test print, and I noticed the red LED was flickering while it was printing. Afterwards I noticed that it was blinking after homing. So I looked it up on Google, and found something that I did not comprehend entirely, but it was someone talking about the probe thinking it is too close to the bed to be able to deploy. I rebooted the machine and noticed that BLTouch did not do it's self-test either. So I allowed movement without homing, lowered the bed a lot, rebooted, and when powering it back on, it did self-test again and constant red LED.
Don't know if the LED blinking observation has anything to do with this issue, but just wanted to mention it.
I do not know much about any of this, but I would have assumed that there were a safety measure in place that immediately stopped the Z movement for G30, in case an error is thrown that the BLTouch cannot deploy for whatever reason. Maybe I could code that into my homings to create a safety net for this issue till we hopefully solve it?
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Flashing red usually indicates error state if the self test is unable to successfully deploy and retract the probe or if the pin is blocked when trying to deploy. Could also be an intermittent wiring break depending on position.
As a precaution you can add the alarm release and pin retract command to the end of config.g and start of homeall to clear any errors just in case.
You can try and take the pin out of the probe and check it/clean it by removing the set screw on the top.
