Purge tower lines / paths in space at the top of a print issue
 
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Purge tower lines / paths in space at the top of a print issue  

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yankeexray
(@yankeexray)
Active Member
Purge tower lines / paths in space at the top of a print issue

I keep getting this issue where phantom lines appear in space several inches above the top of a purge tower with this model.  It is a simple cover with some letters printed in a different color on the print bed only for the first 3 layers.  The print successfully completes, and then as a last action the head moves over the tower (that it hasn't used for ~hundreds of layers) and extrudes two paths into space.  Luckily, it doesn't mess up the print at all, but I cant get the issue to go away no matter how I slice it.  Have tried all kinds of positioning combinations and with/without supports as well as different extruder combinations and layer heights.  Always shows up..  Cant think of any other options to try to make it go away.  Anyone have a theory?

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Posted : 10/07/2019 2:02 am
Dave Avery
(@dave-avery)
Honorable Member
RE: Purge tower lines / paths in space at the top of a print issue

it's intentional - the extruder is purging as it unloads the filament at the end of the job. no need to build a purge tower up that high when all that's left is a move to the park position. 

Posted : 10/07/2019 3:41 am
Dave Avery
(@dave-avery)
Honorable Member
RE: Purge tower lines / paths in space at the top of a print issue

again it's intentional - either they build the tower up to the top level used ( wasting lots of filament) or they purge in mid air over the tower and have a loose purge to clean up. the purge is needed because they run a regular filament unload with purge at the end of the job so there is no filament in the extruder or selector in preparation for the next job

Posted : 16/07/2019 12:00 am
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