GeorgB

@neotko: that was my first idea as well, so that is done! @gr5: your tip was good: for the movement back/forth the blocks had an offset of 2mm. I opened the set screws and changed that. The pity: I did not feel a difference in the resistance when I move the axes... I printed now the same part twice with 90° turned. The result was not very different between both. So that says that my theory of the resistance of the axes is not probably the case - it would be unlikely that both axes have the same issue! I have now tried to improve the extrusion (cleaned the nozzle accurately and changed to a better flowing filament). That made a difference the buckles are now smaller - but still there. The jpg shows the 90° turned examples.. By working on the pulleys I saw the dust on the motors. I can also see that some dust is hanging on the belts. The belt is touching the side of the pulley, that creates probably the dust. I know it is more or less impossible to bring the belt exactly in the middle of the pulley, it always move to one side. Do you also have this dust, means some abrasion from the belts?

That is the point: I have printed maybe a month ago the same part, same filament, same acceleration, same speed with no problems at all. That brings me to the point that it is a hardware problem, nothing to do with software. My suspicion is that the bearing bushes do not glide easy - when I move the nozzle with the bearing bushes without power I can feel different resistances on the way. So maybe there is a slip stick which generates a kind of vibration?! When you move the nozzle without power, is the resistance always the same? or do have stronger and easier points?

printer: UM2 in CURA speed 50 mm/s (acceleration cannot be set in CURA, or did I miss that point?) I have ordered now different ABS-filaments to check if that has an influence...

I have added this to the model to increase strength in that area. I don't think that there is a relation, because I have the same issues also on other parts. What slicer do you use? (I could slice it in Cura and Slic3r without problems!)

Now I understand, I use the german version. In the expert settings is a "automatic repair" with 4 check boxes. All are already turned off.

I tried the same part with Cura - it looks quite different.the stripes change postion with the speed. Anonther issue: if you move the nozzle (UM2, of course power off) do you feel any resistances? If I move the nozle, I feel not the same resistance over the movement. In some position it goes harder compared to others... (sorry I send this message first to the wrong entry..) the stl file is here: https://dl.dropboxusercontent.com/u/2958151/Bike-Flex.stl

Silly question - how can I post an stl-file?

@Labern: thanks for your email. in x-ray mode all is blue, so no red elements I do not understand what you mean with: "you could try turning off fix horrible."?? Can you help me?

I tried with Cura - it looks quite different.the stripes change postion with the speed. if you move the nozzle head (UM2, of course power off) do you feel any resistances? If I move the head, I feel not the same resistance over the movement. With Cura I have the issue that the perimeter goes sometimes outside the model. It is reproducable, it is always on the same points- but not visible in Cura. Any ideas ...??

@tommyph: I print without cooling. (UM2). @shurik: In slic3r you have the option "Infill before perimeters", which is off. So the outer shell is made first.. I reduced from 50 to 35 mm/s which made no difference. What do you think about the top level. Is it underextruded? In my opinion the top layer could be more covered. I tested some options, but was not really successful to have more material on the top level. (right now 3 solid top layer, and the top layer solid infill runs with 50% of the normal speed of 50 mm/s)

Sorry for my limited info... I am printing with ABS (heated plate 90°,ABS 250°,2.85mm), speed 50 mm/s the part is 80x40x15mm. I am using slic3r for slicing. One side has more buckles than the other side. I tried now also with 35mm/s but it made more or less no difference. I made the parts some weeks ago with good surface (i think(?) I made no changes in settings). Tat leads me to think it has something to do with the hardware....

Hello, thanks for your reply.! Underextrusion might be a possible issue, because the toplayers could be tighter - but I did not find a solution for it. The walls are 3 perimeters thick - that is normally quite ok.

In the last week my printings have always those "buckles" on the surface. It looks like the perimeters change slightly positions from slice to slice. I have printed the parts weeks ago (all is fine) but now it has this unnice buckles. I am not aware of changes on the settings. Is that problem of the hardware? Any help is welcome!

Now I use slic3r instead of Cura and all problems are gone ... I have no idea, what is my problem in Cura..

The artifacts are not visible in the layer views. I preinted the model 3x times and the artifacts are always on the same position! So maybe it is in the generated code. The Model itself is clean. Shows Cura the real gcode?