Is it a retraction problem? April 02, 2016 02:08PM |
Registered: 8 years ago Posts: 35 |
Re: Is it a retraction problem? April 02, 2016 03:32PM |
Registered: 8 years ago Posts: 35 |
Re: Is it a retraction problem? April 02, 2016 03:40PM |
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Re: Is it a retraction problem? April 02, 2016 04:52PM |
Registered: 8 years ago Posts: 35 |
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sigxcpu
When you see the shake it is moving to another perimeter. That is the seam and it looks like overextrusion or too high acceleration (or Vxy jerk?)
Re: Is it a retraction problem? April 02, 2016 05:58PM |
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Re: Is it a retraction problem? April 02, 2016 06:08PM |
Registered: 8 years ago Posts: 35 |
Re: Is it a retraction problem? April 02, 2016 06:18PM |
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Re: Is it a retraction problem? April 02, 2016 07:54PM |
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Re: Is it a retraction problem? April 02, 2016 09:27PM |
Registered: 8 years ago Posts: 35 |
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Downunder35m
What you have I call leaking.
Especially PLA at slightly higher temps tends to go almost liquid when not extruded out.
This means when you move from one spot to the next you end up with that drop hitting the start point.
It will smear a bit but the excess plastic remains in place.
Layer after layer this builds up.
Final result in your case: A big bump form that ruins the print.
Here is my suggestion of a fix:
1. With your current print settings print multiple small test cubes.
2. Check the layer bonding and if good lower your print temp but go up again once you notice the layers no longer bond properly.
3. Again start with a test cube (only one this time) but as a thin walled object.
4. Adjust your retraction until you no longer get a blob when a new line starts at the perimeter.
5. Check if your slicer supports different speeds for printing and non printing moves.
6. If it does use a high but stable speed for non printing moves (somewhere in the region of a fast homing speed).
7. Last but not least: If your slicer support cleaning pillars then use it and place the pillar between the objects to be printed but not in a line, let it form a triangle.
If you can at least address 1 - 4 your print should come out much better, 5 and 6 would make it almost perfect but this needs proper calibration of your acceleration and jerk.
Re: Is it a retraction problem? April 03, 2016 05:30AM |
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Re: Is it a retraction problem? April 03, 2016 11:34PM |
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Re: Is it a retraction problem? April 04, 2016 03:05PM |
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Re: Is it a retraction problem? April 04, 2016 09:17PM |
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Re: Is it a retraction problem? April 05, 2016 11:20AM |
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Re: Is it a retraction problem? April 05, 2016 01:10PM |
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Backdraft
Thats what I meant by not really adressing the problem by using the pressure advance since a direct drive setup shouldn't really need that.
Re: Is it a retraction problem? April 05, 2016 01:25PM |
Registered: 8 years ago Posts: 35 |
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JamesK
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Backdraft
Thats what I meant by not really adressing the problem by using the pressure advance since a direct drive setup shouldn't really need that.
I'm not completely convinced that's true, Clearly bowden is more likely to have problems, but you get plenty of pressure related issues with nylon even with direct drive. I see similar behaviour with 3mm pla which surprised me. I keep meaning to try the advance settings, but all the 'not stable' warnings put me off.
Re: Is it a retraction problem? April 05, 2016 08:23PM |
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Re: Is it a retraction problem? April 10, 2016 05:40PM |
Registered: 8 years ago Posts: 35 |