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Strange output from a good gcode file  

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Steve
(@steve-8)
Eminent Member
Strange output from a good gcode file

I am trying to print an stl file that is included in the attachment.  I have included the .stl file, the gcode file, and the Prusaslicer parameters.  When I view the gcode file, it looks good, however, the print has overshoot at the bottom.

Can anybody tell me what is going on with the print and why I am getting the lower overshoot?

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This topic was modified 2 months ago by Steve
Posted : 26/08/2021 11:29 pm
Dan Rogers
(@dan-rogers)
Noble Member
Y axis bearings?

Looks like major axis shifting - if this is the Y direction (left to right in your picture) that you are seeing that "over shoot", it is either your Y motor grub screws (tightened them in correct order) - or your bearing carriage clips are too tight (requires removing the heated bed plate to adjust).

 

Posted : 27/08/2021 6:04 am
bobstro
(@bobstro)
Illustrious Member
A very long shot

This is extremely unlikely, but there was a bug in firmware version 3.8.1 that would cause something like this if you printed using OctoPrint. 

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 27/08/2021 2:12 pm
Steve
(@steve-8)
Eminent Member
Topic starter answered:
I found the problem

I found the problem.  The Y axis drive toothed pulley on the motor shaft was full of dirt/filament leftovers, and the belt kept giving resistance/overshoot when it encountered the stuff between the pulley teeth.  I took off the toothed pulley and cleaned it with a can of compressed air and an dental pick (the dental pick seemed appropriate since I cleaned between the teeth).  I also lubed the Y axis rails and bearings, and lubed the pulley at the other end of the belt.

I have a belt tensioner on the Y axis belt.  Have had it since I built the printer.  Works well.

Printer works fine now.  No overshoot.

BTW:  I have no idea what a "grub screw" is.

Posted : 28/08/2021 8:06 pm
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