Z motor catch and dropping only during startup sequence.
Posted: Tue May 12, 2020 7:44 pm
Hello!
I have a M2 Rev. D, upgraded to Rev. E , and upgraded to Dual extruders for this particular issue. It's been intermittent for a few months now, but has recently become unavoidable.
During the start up sequence, after homing, when the build plate is brought up to the nozzle to purge it catches about a cm above the z endstop switch. After the it stop trying to raise it to the platform for that specific command, it returns to functioning normally.
What's particularly confusing, is I cannot make it catch by any other means. If I raise and lower the Z using the console, it never catches. If I repeatedly home the axis with the console, it never catches. Start up a new print? Catches every time.
Previously when this issue would arise, I could use my hand to help the axis past this point, and it would then print normally. It now catches even with my support.
Things I've tried:
-Starting the print without the build plate to see if weight is the issue.
-Manually helping the build plate rise past the point with my hand it different locations.
-Adjusting the starting scrips to move the Z axis in smaller increments, at separate times, and slower via F.
Here's a video of the issue: https://www.youtube.com/watch?v=-yvl6xYH1iM
The video starts with me homing the Z axis with S3D control panel repeatedly without issue. I then raise and lower the z axis by 100 mm repeatedly without issue.
Starting at around :45 I start a print and show how it catches after homing.
Any ideas? The Z stepper was purchased about two years ago, I don't believe it should be at the end of its lifespan yet.
Thanks!
Cameron
I have a M2 Rev. D, upgraded to Rev. E , and upgraded to Dual extruders for this particular issue. It's been intermittent for a few months now, but has recently become unavoidable.
During the start up sequence, after homing, when the build plate is brought up to the nozzle to purge it catches about a cm above the z endstop switch. After the it stop trying to raise it to the platform for that specific command, it returns to functioning normally.
What's particularly confusing, is I cannot make it catch by any other means. If I raise and lower the Z using the console, it never catches. If I repeatedly home the axis with the console, it never catches. Start up a new print? Catches every time.
Previously when this issue would arise, I could use my hand to help the axis past this point, and it would then print normally. It now catches even with my support.
Things I've tried:
-Starting the print without the build plate to see if weight is the issue.
-Manually helping the build plate rise past the point with my hand it different locations.
-Adjusting the starting scrips to move the Z axis in smaller increments, at separate times, and slower via F.
Here's a video of the issue: https://www.youtube.com/watch?v=-yvl6xYH1iM
The video starts with me homing the Z axis with S3D control panel repeatedly without issue. I then raise and lower the z axis by 100 mm repeatedly without issue.
Starting at around :45 I start a print and show how it catches after homing.
Any ideas? The Z stepper was purchased about two years ago, I don't believe it should be at the end of its lifespan yet.
Thanks!
Cameron