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At my work, we have 3x Ultimaker 2+, 1x Ultimaker 3 and 1x PRUSA i3 mk3s. The Ultimakers have been used quite a lot for the past three years, but the belts and bearings seem ok.

I got heavy ringing with all Ultimakers, but the print on the PRUSA is neat even at a higher speed.

I have a Ultimaker 2+ which I use together with CURA. I print in PLA at 210°C. The print bed is set to 60 °C. I use a print cooling fan at 60 %. The layer height I set to 0.2 mm, the line width 0.8 from the 0.4 mm nozzle. The Printing Speed is set to 30 mm/s for walls and 50 mm/s for infill.

Is this a known issue with Ultimakers?

How can I fix it?

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The comparison with what I get with the PRUSA is uncanny:

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EDIT

I have tighten the screws on the extruding head and cleaned the machine, but I still notice a mechanical play. Therefore, the result is not satisfying...

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  • $\begingroup$ I don't see any heavy ringing, or do you mean the bulging on the railing of the boat? $\endgroup$ – 0scar Jul 14 '20 at 6:55
  • $\begingroup$ @0scar I've added a picture of what quality I am expecting. If it's not ringing I don't know how you call this default where the surface is rippled. $\endgroup$ – nowox Jul 14 '20 at 10:30
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    $\begingroup$ Is this old filament? My Ultimaker prints like the bottom. What material, what settings, see e.g. "Help us help you!"> $\endgroup$ – 0scar Jul 14 '20 at 12:02
  • $\begingroup$ The filament is not that old. I am sure it is caused by some vibrations somewhere. $\endgroup$ – nowox Jul 14 '20 at 18:29
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    $\begingroup$ @Dr.MantisTobbogan Actually that speaks of similar use: if 10 cars show the same behavior after the same distance, it might be the wear of the same part or a flaw in the design. $\endgroup$ – Trish Jul 14 '20 at 20:28
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have been used quite a lot for the past three years

The problem, even if belts and such seem ok, might be that other parts start to wear out. The part that contributes te most to ringing is the motion system. Grooves in rails or worn out bearings are a classic way that introduces some freedom in the system that can result in rattle and ringing. A photo of the rails and bearings might help to identify wear. Remember that most bearings need some sort of lubricant to work properly and reduce the wear in them, which should be part of the maintenance cycle!

Another source for the errors could be found in the extrusion system. For example, there might be an increased play in the gearing as springs under constant pressure can lose some tension, resulting in too little pressure on the filament, which typically would show up as under extrusion if the pressure is lost completely. On the other side, the hobbled gear that pushes the filament might be worn, resulting in a lack of responsiveness of the filament movement, again resulting in under extrusion after some point. Once more, photos of this area could help to indicate wear and tear.

Another source might be the mounting of the printer - it has been shown beneficial to put printers on a slab of concrete that itself is dampened on a medium density foam, resulting in even dampening that is usually better than the rubber feet of many printers.

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  • $\begingroup$ Very likely due to the extrusion subsystem. Ultimaker uses 2.85 mm filament so filament motion is critical: a little slippage causes visible changes in the extrusion. If the teeth are worn out, this is the case. Worn out bearings (or dirty bearings) can also cause the same, since motion is not smooth. $\endgroup$ – FarO Jul 15 '20 at 9:52
  • $\begingroup$ I've added a photo to my question if it can help. $\endgroup$ – nowox Jul 15 '20 at 13:01
  • $\begingroup$ @nowox That are worn bushings/rods as far as I can tell.It doesn't show the inside of the extruder so hard to tell if there might be other worn parts. $\endgroup$ – Trish Jul 15 '20 at 17:04

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