wavy walls problem

Hey,

I have some problems with wavy walls (see screenshot). I think that is common problem, since i have seen it often on pictures of printed parts.
Any advices what I could try? I have tightened all belts, so that cant be the problem. I have also decreased both, acceleration and printing velocity, but the problem occurs also at low speeds (30mm/s) and low accelerations (<500).

Any ideas?

Some people believe it's the teeth on the belt when it touches the bearing on that axis. They have turned the belt 180 degrees in the idler bearing.

Do the waves match the pattern of your infill?

If so, try more perimeters.

Thanks for your answers, It's not the infill since there is no difference whether i print it solid or not.

it's the motors stepping, not the belts, turn down your motor driver currents as much as possible without dropping steps, and print as slow as you can stand to.

Run a print at 10mm/s with everything else the same.

Edited 1 time(s). Last edit at 08/07/2014 09:55AM by Dirty Steve.

I've seen this kind of thing caused by too high of an acceleration setting. I usually saw this kind of thing near to corners, and it was always on the side of the corner that the extruder was coming out of - not into. What's interesting is that when there is a horizontal hole, the ripples take a circular pattern - it literally looks like ripples on water.

I sort of explained it to myself that I was going around those corners at too high a speed and I was a bit of "shaking". Turning down the acceleration helped quite a bit.

It is related to the 1.8 degree step of most stepper motors, me and several people in my printing group fought with this for a while, flipped belts, toothed idlers, etc. but what reduced it the most was switching to 0.9 step motors, the ripple became exactly half.

It is due to the fact that even with micro-stepping the motors have a 'stronger' tension at it's 1.8 degree positions.

jbernardis is spot on. I get this on my Solidoodle as a result of such small, wide-spread rails. It's the bouncing of the extruder's weight when turning corners. I've had to cram my acceleration down to 3000mm/s². Other ways to help are tightening belts [which you'll have to keep friction low to maintain that tightness effectively], lightening the load through bowden upgrade, etc. It's all about inertia. I also have ridging from motor steps, so I can tell you they are separate and distinct. Where what you are getting comes from corners and is called ghosting, ridging from steps is like a small grid projected down from above.

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