1 Topic by reznor9 (edited by reznor9 2016-03-20 19:03:53)

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Topic: What is causing these imperfections during and after the print?

Was watching my printer and I see that when it has to travel from one end of the print to the other it leaves a scratch on the surface of the previous layer resulting in a scar/scratch. I'm guessing it's due to the nozzle lightly dragging across the surface or maybe oozing of excess material as I do sometimes see thin strings of material that web between pieces when multiple pieces are printed? What is the best way to remedy this?
Do I increase my z-offset, try lowering the temperature further, or play with other settings? What do you guys recommend?

Also on a side note I have experienced at times blemishes on my flat top surface. What causes that?


Left image first layer of print showing the scratch, right is completed print showing blemishes on top layer.
http://soliforum.com/i/?qSMXhoI.jpg

FYI I'm printing on a Da Vinci Pro with Hatchbox PLA(recommended extruder temp 180-210)

My settings:
Tried lowering extruder temp to 175 (lowered 5 degrees below recommended temp because I thought maybe it was oozing and over extruding, didn't fix issue)

Layer height: .15
Infill density:10%
Aside from settings captioned in the pic, the rest are default settings for PLA

2 Reply by carl_m1968 (edited by carl_m1968 2016-03-20 19:34:03)

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Re: What is causing these imperfections during and after the print?

That scratch is normal for the way the Da Vinci software prints. You would need to be able to use a slicer that allows you to avoid crossing perimeters. Also it looks like you are over extruding thus making your final layer too high and the nozzle is touching it.

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3 Reply by reznor9

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Re: What is causing these imperfections during and after the print?

carl_m1968 wrote:

That scratch is normal for the way the Da Vinci software prints. You would need to be able to use a slicer that allows you to avoid crossing perimeters. Also it looks like you are over extruding thus making your final layer too high and the nozzle is touching it.

Im looking up possible fixes for over extrusion and I can't find solutions that reflect settings available to da vinci users or the xyz software. What changes might you recommend for the over extruding?

4 Reply by carl_m1968

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Re: What is causing these imperfections during and after the print?

For Xyz software you have little freedom. You now can see why so many are flashing to Repetier firmware and host. Your only other option is use another slicer, convert the stl to the correct format and encoding then replace one of the sample prints on the sdcard with yours. There are guides on doing this.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

5 Reply by reznor9 (edited by reznor9 2016-03-21 16:44:41)

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Re: What is causing these imperfections during and after the print?

As mentioned there was nothing I could do about the nozzle drag marks. But I tweaked the settings by increasing top surface and solid infill thickness(not density). Also slowed the print speed down a little. Surface came out much smoother. Not sure why but my prints seem to have a lot of stringing between parts. I don't think it effects the actual print but it never was an issue prior.

http://soliforum.com/i/?5tzAh3I.jpg

6 Reply by 3Dex

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Re: What is causing these imperfections during and after the print?

Im glad you've got it printing to how you like it.

Those stringy bits can probably be removed by increasing the retraction settings on your slicer

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7 Reply by Telemachus

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Re: What is causing these imperfections during and after the print?

A small sponge with acetone will do wonders post print...

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8 Reply by reznor9 (edited by reznor9 2016-03-21 21:14:16)

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Re: What is causing these imperfections during and after the print?

Telemachus wrote:

A small sponge with acetone will do wonders post print...

Acetone as I understand it is good for smoothing prints when working with ABS? On PLA I don't think it works the same although I know smooth-on sells a product that smooths PLA called XTC-3D... I've never tried it though.

9 Reply by scobo

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Re: What is causing these imperfections during and after the print?

3Dex wrote:

Im glad you've got it printing to how you like it.

Those stringy bits can probably be removed by increasing the retraction settings on your slicer

Those settings aren't available in xyzware.
As Carl said, you'd need to use a different slicer which isn't so easy with stock firmware.

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10 Reply by reznor9

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Re: What is causing these imperfections during and after the print?

scobo wrote:
3Dex wrote:

Im glad you've got it printing to how you like it.

Those stringy bits can probably be removed by increasing the retraction settings on your slicer

Those settings aren't available in xyzware.
As Carl said, you'd need to use a different slicer which isn't so easy with stock firmware.

XYZware Pro does have retraction settings...

11 Reply by scobo (edited by scobo 2016-03-22 13:38:11)

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Re: What is causing these imperfections during and after the print?

reznor9 wrote:
scobo wrote:
3Dex wrote:

Im glad you've got it printing to how you like it.

Those stringy bits can probably be removed by increasing the retraction settings on your slicer

Those settings aren't available in xyzware.
As Carl said, you'd need to use a different slicer which isn't so easy with stock firmware.

XYZware Pro does have retraction settings...

Ok, cheers for that.
I've only ever used the old xyzware with the original Davinci which doesn't.

To the OP - in that case, try setting retraction to around 3mm.

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12 Reply by reznor9

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Re: What is causing these imperfections during and after the print?

scobo wrote:
reznor9 wrote:
scobo wrote:

Those settings aren't available in xyzware.
As Carl said, you'd need to use a different slicer which isn't so easy with stock firmware.

XYZware Pro does have retraction settings...

Ok, cheers for that.
I've only ever used the old xyzware with the original Davinci which doesn't.

To the OP - in that case, try setting retraction to around 3mm.

Default retraction is already enabled at 6mm... maybe Ill increase little by little to see if it resolves the issue.

13 Reply by scobo

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Re: What is causing these imperfections during and after the print?

At first, I thought 6mm sounded rather a lot but then I remembered the Pro is a bowden setup.
So yes, you might want to try a bit more retraction, I believe bowden extruders require a good bit more retraction than direct drive.

Davinci 1.0 with repetier firmware & E3D V6 Lite
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