gav

Many thanks for the info gr5 and for the quick response. Yep I upgraded to the latest firmware 15.02.01 I checked the z- lead screw and and surrounding screws which were a bit loose so I tightened them slightly. There didn't appear to be any significant play in the lead screw nor anything interfering with it. I printed another z-resonance test piece and monitored the temperature but there wasn't any fluctuation on either the bed or nozzle temp - both stayed around the set parameters only going up and down 1 degree occasionally. The ridges were still on the column, perhaps a slight improvement but no major difference. I'll print a larger section as you suggest to see if the ridges are still present and if the interval changes at all. Thanks again Incidently I printed a couple of Robots using the settings you'd given in this thread http://umforum.ultimaker.com/index.php?/topic/3038-can-your-ultimakerultimaker2-print-such-quality/?p=28588 Came out very well indeed!

Hi All, I'm a UM2 user and look after 3 of them where I work. On the whole I've had no major issues and have often used this forum when running into a problem and it's served me well. However I've come across an issue of quite severe horizontal ridges at regular intervals on parts printed using one of the machines and I am stumped - hence my first post. You can see from the image below what the problem is. The column should be straight and smooth like in this one, printed on another machine - same gcode, both white PLA. I was suffering from underextrusion with a couple of my machines and after running through some of the remedies (which didn't solve the problem) I decided to try tightening the short belts - loosening the 4 fixing screws for the stepper motors, pressing down on the motor and re-tightening each screw. I did the same procedure on both machines and it's seemed to have eliminate the underextrusion but for one of them I'm now getting these ridges. I printed a z-resonance test piece to see if it was anything to do with the geometry but the same thing happened and the ridges are at the same interval, approx. 3mm I'm using the latest update of Cura and firmware 15.02.01 Anyone have any thoughts on what's happening? Thanks Gav