1 Topic by JB

  • JB
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Topic: Waves and oscillations

Has anyone seen this decaying wave train before? After a sharp transition, the print head oscillates for a few mm of travel. i.e. under-damped response. Guesses on whether to attack this as a hardware or software issue first?
And does anyone have a safe speed recommendation to avoid overshoot on square corners?

I'm running 50 mm/s, .3mm layers, Repetier Host+Skeinforge, Lash control on minimally (.1mm each axis in sf, turned off in firmware), firmware current as of mid November.

Thanks,
Jon

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2 Reply by Brad

  • Brad
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Re: Waves and oscillations

Is it Z axis wobble?

Brad's Website

3 Reply by IanJohnson

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Re: Waves and oscillations

You can see a good example of it here -

http://solidoodletips.files.wordpress.com/2012/12/torture_1.jpg?w=848

The simplest thing to do is reduce the speed for outer perimeters to something like 25, and leave inner perimeters at 50 and higher yet for sparse infill.  I've been finding that it doesn't take much speed to get overshoot on the S2.  I figure that is a tradeoff you get for price.  It can make some high quality prints, but if you want high quality and high speed, you have to pay a higher price.

4 Reply by bahstrike

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Re: Waves and oscillations

Is it a Mexican hat wavelet?  tongue

5 Reply by JB

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Re: Waves and oscillations

Thanks for the responses. The lower perimeter speed works and it inspired me to try 100 mm/s infill which worked well and cuts print time. Z axis seems fine as the walls are smooth except for near direction changes.... And for bahstrike, these waves are only cool enough to work in forward time. No sombreros. sad
Now off to try all the corner lifting antidotes from other soliforum threads.
Cheers,
Jon

6 Reply by cmetzel

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Re: Waves and oscillations

JB wrote:

Now off to try all the corner lifting antidotes from other soliforum threads.

Save yourself some time.  95deg bed and hairspray is the way to go.

If you're modeling your own items, design a brim on your corners to help large items stick otherwise you can turn on a brim in slic3r.

7 Reply by DePartedPrinter

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Re: Waves and oscillations

cmetzel wrote:
JB wrote:

Now off to try all the corner lifting antidotes from other soliforum threads.

Save yourself some time.  95deg bed and hairspray is the way to go.

If you're modeling your own items, design a brim on your corners to help large items stick otherwise you can turn on a brim in slic3r.


I agree with the hairspray and bed temp.

SD2 with E3D, SD Press, Form 1+
Filastruder
NYLON (taulman): http://www.soliforum.com/topic/466/nylon/