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Shaner

filament feeds reverese at start

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I just bought a used Ultimaker Original plus to learn about 3D printers and hoping someone can help with a few growing pains.  

 

When I go to start a print the filament gets pulled back from the print head about 12" then slowly feeds back to the print head.  The printer starts moving but it will be at least 2 minutes before the filament has been feed back to the print head missing the start of laying a good base.

 

The other question is when I go to level bed through Cura I found the Z axis on the machine has been moved down 3mm so I need to bring it back to zero in the lcd display on the machine.  Is this normal.

 

Thanks in advanced for any help

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