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surface defects, groove and blob observed, need input

Posted by trustmiao 
surface defects, groove and blob observed, need input
July 02, 2014 05:46AM
Hello guys,

the attached photo showed a part of vica printed from a kossel like printer. Two kinds of surface defects can be observed, which I marked on photo as A groove and B blob.
Here are some observations:

A Groove, groove happens when nozzle finished parameter and starts to move in to paint infil, it drags ipart of the parameter around the end point towards inside together.
I was thinking, maybe draw parameter first will help, but would like to hear more suggestions.

B Blob, not sure this is typical or not, please excuse me if it has been asked million times. It happens where nozzle lands after a jump. I can't be sure it happens before or during restart, but it accumulates every layer.

let's discuss and find a way to get rid of these scars on surface. thanks in advance
Attachments:
open | download - defects.jpg (73.8 KB)
Re: surface defects, groove and blob observed, need input
July 06, 2014 03:09PM
When this happens to me, it is due to filament leaking out of the nozzle between gaps. You can reduce this by increasing the non-print movement speed in the Slicer or increase the retraction speed/length until you find a good combination.
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