1 Topic by Antonious (edited by Antonious 2015-09-28 11:47:10)

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Topic: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

Despite my poor knowledge I've just tried my first print after jump to Repetier firm (the previous ones were 4 little prints with stock firm and soft). I've used Cura as slicer and the result is good in my opinion. The same figure printed with stock firm and soft took 50 minutes (best quality and lowest speed settings). The same figure has taken 16 min on Repetier with very similar output look/quality (actually the adjusted speed hasn't been the lowest, but very near the lowest).

What is a bit worse, in my opinion is a little wavy pattern (the axis lines of the little waves go from the botton to the top).

(By the way, is this stock XYZ ABS color white or natural? -I don't know-)

Could be this pattern be explained or avoided?http://soliforum.com/i/?jD16w1T.jpg

2 Reply by scobo

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

Hard to tell from the picture but it doesn't look too bad to me.
The stock ABS is pretty poor quality though. You should see an improvement with 3rd party ABS.

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3 Reply by Antonious

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

I tried to take in the picture the lines that form the waves. They are on the top face (the "V" shape).

4 Reply by scobo (edited by scobo 2015-09-28 15:01:51)

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

Does it look anything like this ?

http://soliforum.com/i/?bfWfyNh.jpg

If so, that's a pretty normal top surface finish. You'll never get it as flat and smooth as the bottom.

Davinci 1.0 with repetier firmware & E3D V6 Lite
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5 Reply by Antonious

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

scobo wrote:

Does it look anything like this ?

http://soliforum.com/i/?bfWfyNh.jpg

If so, that's a pretty normal top surface finish. You'll never get it as flat and smooth as the bottom.

Yes, that top surfaces of yours are similar to that I obtain, but in my picture what I want to remark are the vertical waves in the "V" face that was printed in vertical (it's not the top of the printing).

6 Reply by scobo

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

Hmmm, that's different then.
Could be a bit of over extrusion.
You could try reduction the flow rate in the Cura settings.

Davinci 1.0 with repetier firmware & E3D V6 Lite
Anycubic Photon DLP printer, Einscan-S 3D scanner
Simplify3d, 123D Design, Meshmixer
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7 Reply by Antonious

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

scobo wrote:

Hmmm, that's different then.
Could be a bit of over extrusion.
You could try reduction the flow rate in the Cura settings.

Thank you, I have to experiment your suggestion. I'll post when done.

8 Reply by mark.burton

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

calibrating your extruder is very help full.

How I do it is measure 150 mm and mark it. (I measure from where it enters the extruder) then tell repetier to extrude 100 mm (note you have to have the hot end up to temp for it to extrude)

Then measure it again. we need to know the amount actually extruded so we take 150 - the amount of your 2nd measurement and you will have the amount actually extruded. lets call this value Y

Next we need to know the steps per mm for the extruder so we can go into the view firmware (alt + e) and look for  extr .1 steps per mm (lets call this X).  Now To figure out what you need to change this to do the following take (100 * x )/y = then new value for x

Enter the new value and then repeat just to verify.  You want to get this close it doesn't have to be exact so a few mm off isn't a big deal if its more then 5 mm I would adjust it  as long as you are within 5 I would leave it

9 Reply by Antonious (edited by Antonious 2015-09-29 10:03:35)

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

I'm a bit lost, surely because I'm fully new to this and because my poor English, but reading several times your post I think I understand now, but I have to ask you:

Where do you ask to Repetier to extrude 100mm?

To check your suggestion I'm doing an "alt-e" in Repetier-host but there isn't any response, maybe I have to connect the printer before to do it?

I'm grateful for your clarifications.

10 Reply by Antonious

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

Antonious wrote:
scobo wrote:

Hmmm, that's different then.
Could be a bit of over extrusion.
You could try reduction the flow rate in the Cura settings.

Thank you, I have to experiment your suggestion. I'll post when done.

I did a test setting in Cura Filament->Flow to 90% but same result, the wavy pattern.

Below a comparison between a print under stock firm an soft (left) and the same print with Repetier (right), note the different aspect in the "V" face, with smooth waves in the Repetier's print.

http://soliforum.com/i/?3oynrPK.jpg

11 Reply by mark.burton

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

Were you moving significantly faster? if so you may be getting a harmonic vibration. Try slowing the print speed down.

12 Reply by carl_m1968

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

How many perimeter walls are you printing and what is your infill percentage? That actually looks to me like thin perimeter walls where the infill joined the wall and distorted it just a bit.

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13 Reply by Antonious

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

mark.burton wrote:

Were you moving significantly faster? if so you may be getting a harmonic vibration. Try slowing the print speed down.

The piece on the left (without waves) was printed in XYZware and stock firm at the lowest speed. The one on the right with Reptier firm and software at a very low speed (maybe 10% of the total length of the slider in Cura settings). In my opinion there isn't a significant difference). That about a harmonic vibration is a interesting approach.

Thanks.

14 Reply by Antonious

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

carl_m1968 wrote:

How many perimeter walls are you printing and what is your infill percentage? That actually looks to me like thin perimeter walls where the infill joined the wall and distorted it just a bit.

Shells are adjusted to 0.8mm, and infill density to 25%.

Do you think that the infill overlap (15%) could have any influence on this waves?

15 Reply by evanalmighty

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

That looks more like the Z wobble rather than print settings.

16 Reply by carl_m1968

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

evanalmighty wrote:

That looks more like the Z wobble rather than print settings.

That we would be hardware and show regardless of software. He only gets it when he uses cura slicer settings.

Printing since 2009 and still love it!
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17 Reply by evanalmighty

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Re: First print in Repetier+Cura. Satisfied but... slighty wavy pattern.

But if the bed is loose and his Cura setting for jerk/acceleration is high it could cause the bed to wobble more than normal.  I know software and hardware are separate issues, but sometimes one software can uncover a hardware issue that another software might not.

carl_m1968 wrote:
evanalmighty wrote:

That looks more like the Z wobble rather than print settings.

That we would be hardware and show regardless of software. He only gets it when he uses cura slicer settings.