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OK, well it looks quite small and with those narrowing cones I think you are way too fast. I suggest..
30 mm/s
fan 100%
You do not mention extruder temp but cooler will help reduce/remove stringing. At 30 mm/s and .100 layers I would suggest 190 for the extruder.
I do not know if you can manually change the print speed during a print on a UM3 but you can you may want to reduce it to 20 mm/s as you start to get closer to the top of the cones.
Apart from the 1st layer (20 mm/s) set all your other printing speeds to 30mm/s i.e. the same as you main print speed.
You do not say what your retraction settings are but yes they may be helping to cause the problem; although if they are standard Cura settings (which I have never used so do not know what they are) one would think they will be OK. I do not have access to mine on this PC; I will try and get them tomorrow
Start by lowering the temperature and speed. There used to be a plugin to change settings based on height. I can only find this one, but I don't think it works with the latest Cura: https://www.youmagine.com/designs/swap-at-z
You could increase the retraction distance, but that may create more trouble than it's worth.
One more thing: it's normal that there is stringing inside the infill. Because it will not be visible anyway, there's no retraction happening when printing the infill, so that's fine.
My retraction settings, for PLA, up to 18 months ago were
Distance 5.5mm
Speed 50 mm/s
Minimum travel 0.8mm
Maximum count 90
Min. extrusion distance 5.5mm
Then I tried the nGen filament and got a lot of stringing. I overcame that by changing
Minimum travel from 0.8mm to 1.0mm
Min extrusion distance from 5.5mm to 0.2 mm
And I have used these new settings with PLA ever since (and PLA was fine on the older settings). Which only goes to show that the material in use can affect it, even it is one manufacturers PLA compared with another's PLA and that you may need to experiment a bit to get it right for you. I am not trying to suggest that the above settings are the best and you should use them, just that the settings work for me. The change in the min. extrusion distance is dramatic and I have no memory of what led me to that change.
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Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more.
S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
(Sorry, was out of office when this released)
This update is for...
All UltiMaker S series
New features
Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
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yellowshark 153
OK, well it looks quite small and with those narrowing cones I think you are way too fast. I suggest..
30 mm/s
fan 100%
You do not mention extruder temp but cooler will help reduce/remove stringing. At 30 mm/s and .100 layers I would suggest 190 for the extruder.
I do not know if you can manually change the print speed during a print on a UM3 but you can you may want to reduce it to 20 mm/s as you start to get closer to the top of the cones.
Apart from the 1st layer (20 mm/s) set all your other printing speeds to 30mm/s i.e. the same as you main print speed.
You do not say what your retraction settings are but yes they may be helping to cause the problem; although if they are standard Cura settings (which I have never used so do not know what they are) one would think they will be OK. I do not have access to mine on this PC; I will try and get them tomorrow
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pbackx 11
I think @yellowshark explained it well.
Start by lowering the temperature and speed. There used to be a plugin to change settings based on height. I can only find this one, but I don't think it works with the latest Cura: https://www.youmagine.com/designs/swap-at-z
You could increase the retraction distance, but that may create more trouble than it's worth.
One more thing: it's normal that there is stringing inside the infill. Because it will not be visible anyway, there's no retraction happening when printing the infill, so that's fine.
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yellowshark 153
My retraction settings, for PLA, up to 18 months ago were
Distance 5.5mm
Speed 50 mm/s
Minimum travel 0.8mm
Maximum count 90
Min. extrusion distance 5.5mm
Then I tried the nGen filament and got a lot of stringing. I overcame that by changing
Minimum travel from 0.8mm to 1.0mm
Min extrusion distance from 5.5mm to 0.2 mm
And I have used these new settings with PLA ever since (and PLA was fine on the older settings). Which only goes to show that the material in use can affect it, even it is one manufacturers PLA compared with another's PLA and that you may need to experiment a bit to get it right for you. I am not trying to suggest that the above settings are the best and you should use them, just that the settings work for me. The change in the min. extrusion distance is dramatic and I have no memory of what led me to that change.
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