wavy walls problem

Re: wavy walls problem

MrDoctorDIV — Fri, 08 Aug 2014 11:35:09 -0400

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.

Re: wavy walls problem

Dirty Steve — Fri, 08 Aug 2014 11:29:08 -0400

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.

Re: wavy walls problem

jbernardis — Thu, 07 Aug 2014 13:44:23 -0400

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.

Re: wavy walls problem

Dirty Steve — Thu, 07 Aug 2014 09:50:29 -0400

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.

Re: wavy walls problem

Eistee — Thu, 07 Aug 2014 04:18:15 -0400

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

Re: wavy walls problem

DonaldJ — Wed, 06 Aug 2014 12:20:45 -0400

Do the waves match the pattern of your infill?

If so, try more perimeters.

Re: wavy walls problem

KingRahl — Wed, 06 Aug 2014 09:34:34 -0400

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.

wavy walls problem

Eistee — Wed, 06 Aug 2014 09:14:11 -0400

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?