Auto Leveling Crashing in Bed

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Auto Leveling Crashing in Bed

Postby rsoko » 2015-Mar-Mon-22-Mar

I have a simple metal and have been searching for an issue to my autolevel probe, but have not been able to find a solution yet. I completed the Metal Simple Kit and still cannot print without the auto probe crashing into the bed on auto leveling (Before printing stage).

What I have done following the printrbot metal simple directions in Cura:
Connected the printer with power and homed x and y axis
Clicked Z +10, 3 times to raise the z-axis
Heated up the hot end to 210*
Entered M501 to see the z at 0.0
Inserted PLA filament
Manually adjusted bed so that the hotend is touching just above the bed and used the black spacer under the z sensor.
Then Clicked Print

When I click print the z-axis rises then continues to drive into the bed on during auto calibration and the light on the z-sensor lights up, but continues to drive into he bed without stopping. I have to disconnect the power to stop it. I checked to see if the z-probe was detecting the board and to see if it was not detecting at a higher height (Used a command code from another post to confirm the sensor was triggered at lower height and open at higher). any ideas what to try next???
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Auto Leveling Crashing in Bed

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Re: Auto Leveling Crashing in Bed

Postby etxbkst » 2015-Mar-Tue-00-Mar

Did you download the cura (I'm assuming that's the software you're using) file with printrbot settings to be sure you have the correct start code?
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Re: Auto Leveling Crashing in Bed

Postby frankv » 2015-Mar-Tue-01-Mar

What happens when you send G29 (the auto-level command) from the terminal?
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Re: Auto Leveling Crashing in Bed

Postby thawkins » 2015-Mar-Tue-02-Mar

rsoko wrote:I have a simple metal and have been searching for an issue to my autolevel probe, but have not been able to find a solution yet. I completed the Metal Simple Kit and still cannot print without the auto probe crashing into the bed on auto leveling (Before printing stage).

What I have done following the printrbot metal simple directions in Cura:
Connected the printer with power and homed x and y axis
Clicked Z +10, 3 times to raise the z-axis
Heated up the hot end to 210*
Entered M501 to see the z at 0.0
Inserted PLA filament
Manually adjusted bed so that the hotend is touching just above the bed and used the black spacer under the z sensor.
Then Clicked Print

When I click print the z-axis rises then continues to drive into the bed on during auto calibration and the light on the z-sensor lights up, but continues to drive into he bed without stopping. I have to disconnect the power to stop it. I checked to see if the z-probe was detecting the board and to see if it was not detecting at a higher height (Used a command code from another post to confirm the sensor was triggered at lower height and open at higher). any ideas what to try next???


Known problem with either faulty wiring on probe or blown FET on printrboard.

Perform this test with the print head in the center of the bed

1. power down and then power up your printer.
2. wind the z axis down BY HAND until the red light comes on on the probe.
3. wind it back again until the red light goes out.
4. Send an M119 command to the printer, and check the output from the board, it should list the status of all 3 end-stops for x,y and z. z should be listed as "open"
5. Wind the z axis back down until the red light comes on again
6. Send an M119 command to the printer and check that the z axis status now lists as "TRIGGERED".

if that is OK, check the same process in all 4 corners of the bed. if any don't change from "open" to "Triggered" then you have an intermittent (flex related) break in the probe wire. if they always say "open" or "TRIGGERED" regardless of bed position or state of the read light then you have a permanent fault which can either be a permanent break in the cable or a blown input gate on the board.

PBHQ will normally replace any broken part without question, but its best to get a good idea where the fault lies.
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Re: Auto Leveling Crashing in Bed

Postby rsoko » 2015-Mar-Tue-19-Mar

etxbkst wrote:Did you download the cura (I'm assuming that's the software you're using) file with printrbot settings to be sure you have the correct start code?


I downloaded Cura and have set it as a Printrbot metal in the setup process.
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Re: Auto Leveling Crashing in Bed

Postby rsoko » 2015-Mar-Tue-19-Mar

I have just checked and my z-probe and it is always open no matter how close or where on the bed I am.

thawkins wrote:
rsoko wrote:I have a simple metal and have been searching for an issue to my autolevel probe, but have not been able to find a solution yet. I completed the Metal Simple Kit and still cannot print without the auto probe crashing into the bed on auto leveling (Before printing stage).

What I have done following the printrbot metal simple directions in Cura:
Connected the printer with power and homed x and y axis
Clicked Z +10, 3 times to raise the z-axis
Heated up the hot end to 210*
Entered M501 to see the z at 0.0
Inserted PLA filament
Manually adjusted bed so that the hotend is touching just above the bed and used the black spacer under the z sensor.
Then Clicked Print

When I click print the z-axis rises then continues to drive into the bed on during auto calibration and the light on the z-sensor lights up, but continues to drive into he bed without stopping. I have to disconnect the power to stop it. I checked to see if the z-probe was detecting the board and to see if it was not detecting at a higher height (Used a command code from another post to confirm the sensor was triggered at lower height and open at higher). any ideas what to try next???


Known problem with either faulty wiring on probe or blown FET on printrboard.

Perform this test with the print head in the center of the bed

1. power down and then power up your printer.
2. wind the z axis down BY HAND until the red light comes on on the probe.
3. wind it back again until the red light goes out.
4. Send an M119 command to the printer, and check the output from the board, it should list the status of all 3 end-stops for x,y and z. z should be listed as "open"
5. Wind the z axis back down until the red light comes on again
6. Send an M119 command to the printer and check that the z axis status now lists as "TRIGGERED".

if that is OK, check the same process in all 4 corners of the bed. if any don't change from "open" to "Triggered" then you have an intermittent (flex related) break in the probe wire. if they always say "open" or "TRIGGERED" regardless of bed position or state of the read light then you have a permanent fault which can either be a permanent break in the cable or a blown input gate on the board.

PBHQ will normally replace any broken part without question, but its best to get a good idea where the fault lies.
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Re: Auto Leveling Crashing in Bed

Postby rsoko » 2015-Mar-Tue-19-Mar

Gotta love Printrbot's support. They are sending a new z-probe soon! They had me do a test to check to see if the board was faulty or the z-probe. Thanks again for the help!!!
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Last edited by rsoko on 2015-Mar-Tue-21-Mar, edited 1 time in total.
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Re: Auto Leveling Crashing in Bed

Postby RetireeJay » 2015-Mar-Tue-21-Mar

rsoko wrote:Can I simply check the continuity of the z-probe to determine if that is the issue?


Almost certainly, the output of the Z probe is not a switch, it's an active component (a transistor). It's possible to check it with a meter if you hook it up just right, but the M119 command will do the job for you.
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Re: Auto Leveling Crashing in Bed

Postby rsoko » 2015-Mar-Tue-21-Mar

Thanks for the help. I emailed printrbot support to see what to do next.

Update:
Turns out it was a bad z-sensor and they are shipping me a new one.
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