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JohnFox

Z axis not working during retraction

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I have had to replace my nozzle sensor and did a nozzle replacement at the same time.

Normal printing now looks OK, a test print which did not require retraction looks perfect.

However, when I print an object where retraction is required, the Z axis motor slows down and eventually stops turning, killing the print.

I strongly suspect this is electronic as I had to undo the controller in order to get at the sensor connector, so worried I have upset something.

The print that failed has been made several time before without any problems, so the fault does not lie with the Cura file. Z travel looks perfect, no evidence of mechanical issues.

Any ideas?

Suspect I have disturbed something so that either the retract or Z motor is drawing too much power and the controller can't run both at the same time.

Just run another test on a larger object that needs retraction. Z axis is working now but it is clearly slower than normal while retraction is on. Just about to repeat the test with retraction switched off.

Edited by Guest

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Hi John,

You can try setting the retraction length (not the speed) on the printer itself to 0.0mm to see if it makes any difference. If it resolve the issue then it may be related to the feeder motor.

The retraction is part of the feeder motor so if extrusion occur normally on a print not requiring retraction then it might not be related.

Do you know if your print uses z-hop? You can look in the gcode to see if it's the case. Between every G10 G11 code you will see a G0 with Z information. If that's the case then maybe z stepper motor is not connected properly anymore or got burned somehow and doesn't like to be used very often.

Please post a picture or video of the issue.

Edited by Guest

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Dude

I did a system reset and things seemed to have improved, at least the object is now printing as it should.

What I have noticed is that during the layers when retraction is occurring, the Z motor speed seems to be about half the normal step speed, it's quite obvious. What I don't know, is whether this has always been the case. When the fault was happening, the Z speed appeared to get slower and slower until it didn't work at all.

The feeder retraction speed seems to be as it always was, so I don't think that has been affected.

Later on, I will check all the motor connectors, they are the most obvious source of the fault.

Not sure about Z hop, never been into the Gcode.

It almost looks like a processor overload.

thanks

Hi John,

You can try setting the retraction length (not the speed) on the printer itself to 0.0mm to see if it makes any difference. If it resolve the issue then it may be related to the feeder motor.

The retraction is part of the feeder motor so if extrusion occur normally on a print not requiring retraction then it might not be related.

Do you know if your print uses z-hop? You can look in the gcode to see if it's the case. Between every G10 G11 code you will see a G0 with Z information. If that's the case then maybe z stepper motor is not connected properly anymore or got burned somehow and doesn't like to be used very often.

Please post a picture or video of the issue.

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Whatever it was doesn't seem to be an issue now. Z travel is clearly slower during retraction but it's not a problem.

Obviously due to the little gremlin that lives in the controller section, I disturbed him :)

 

Hi John,

You can try setting the retraction length (not the speed) on the printer itself to 0.0mm to see if it makes any difference. If it resolve the issue then it may be related to the feeder motor.

The retraction is part of the feeder motor so if extrusion occur normally on a print not requiring retraction then it might not be related.

Do you know if your print uses z-hop? You can look in the gcode to see if it's the case. Between every G10 G11 code you will see a G0 with Z information. If that's the case then maybe z stepper motor is not connected properly anymore or got burned somehow and doesn't like to be used very often.

Please post a picture or video of the issue.

 

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