Crazy printhead failures at the end of the print

[Daspike 0]

Hello everybody,

 

I don't know why, my um2e+ recently started to fail at the end of the prints. Almost every time.

 

The printer print perfectly until the last layer, and then purge the head on the print, causing a "blob" of plastic on top of it then go to the zero position without moving the z axis down, causing damage to the print, an it also take back the filament way to much in the bowden tube, wich forces me to re-feed everytime the print head.

 

It's appening very often since then and I'm out of ideas :

 

• I did a factory reset
• Installed new firmware
• Instaled the latest version of cura...

Nothing has really solved the issue, and I very disapointed now ...

 

Someone having the same issue?

 

Best regards,

 

David