Unresolved New lead screws, new ribbing.

Hi guys. Has anyone noticed a change in the type of ribbing they get since installing the new lead screws? With the old ones, the ribbing matched the thread of the screws, as expected. But this time it's more of a slight wave than anything. Any ideas as to what causes this? I've included a few pictures. The ribbing occurs all over the prints, not just inside the highlighted areas. I just chose those areas because it's where the ribbing shows up best on my potato cam.

 

I calibrated it properly but if I set the extrusion multiplier to 100% I get breaks on prints with domes. If I set it to 110% they print correctly. Is that enough of an overextrusion to cause this problem?

 

I use Cura. I've tried Skeinforge, MatterControl, Slic3r and Kisslicer. I never used to have an issue with domes either. Honestly this printer just does whatever it wants and you just have to hope it decides to be nice on any given print.

I'll try a print with the lower extrusion percentage and see if the ribbing goes away. I spoke to a Robo3D support person on Skype and they said it might be a bent rod. Doesn't look like it is but if that turns out to be the case hopefully I won't get charged import tax on a replacement like I was when I bought the "upgrade".

 

I think me and my 1500 euro (and growing) paperweight will have to disagree with you on that one, Mark! But I'll keep trying. Hopefully it's an extrusion issue.

 

I'm a year in. I'm not a novice with it anymore and I'm out of warranty unfortunately!

 

Do your lead screws wobble?

Print the Makezine Z resonance test and post clear pictures: http://www.thingiverse.com/thing:533472

 

Don't you mean Wobble Screws, I have this same issue with the new lead screws, but only really see it with the white filament, im sure its still there with the other colors but also think some of it has to do with the heated bed, A good way to find out is to print a test piece without the bed heated and see the outcome. Also How fast are you printing?

 

Yes both screws wobble slightly when I look at the top of them. The old ones did too, and far more, but didn't create a z-ribbing pattern like this one. It's not terrible, but it isn't acceptable either. I actually never use the heated bed. I leave it cold and PLA still sticks to tape very well. I tried it on once and it warped the bottom of my print. I print at 25mm/s.

 

Very interesting, well I guess next step is calibrating the extruder.

 

My last set I had a bb in the bottom of the HC, then wrapped tinfoil around the screw then set it in the coupler loaded with superglue, it was perfect. but still had slippage after awhile the glue broke down, hence lead screws to the rescue, NOT.

 

Every problem I post gets that video as a response, lol. I know it off by heart by now. My extruder is calibrated. The leadscrews seem to be an expensive downgrade for a lot of people!

 

So is the only way to correct the problem to wait for replacements to be shipped from the U.S. to Ireland?

 

Is there a way to fix it without spending that much more money? This printer is more of a kit than a functional printer. Could I pin the tops of the rods to stop them wobbling. It'd be hard though since I've removed the top cover.