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The warts look to me like the classical blobbing problem caused by pressure increase/decrease in the extruder. For example, Sailfish firmware has the JKN algorithm to compensate for this: http://www.makerbot.com/sailfish/tuning/
Now what you can do is make sure the infill and perimeter speeds are the same. If you can, increase the acceleration for travel moves. The workaround in Slic3r of changing the perimeter order is sometimes effective as you see but it's sort of masking the real problem.
About the top of the sphere there are lots of options to help with that. You can increase the minimal layer time, make sure max fan speed is 100%, and decrease the minimum speed. You can also print two objects at the same time, thereby giving more time to cool.
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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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The warts look to me like the classical blobbing problem caused by pressure increase/decrease in the extruder. For example, Sailfish firmware has the JKN algorithm to compensate for this: http://www.makerbot.com/sailfish/tuning/
Now what you can do is make sure the infill and perimeter speeds are the same. If you can, increase the acceleration for travel moves. The workaround in Slic3r of changing the perimeter order is sometimes effective as you see but it's sort of masking the real problem.
About the top of the sphere there are lots of options to help with that. You can increase the minimal layer time, make sure max fan speed is 100%, and decrease the minimum speed. You can also print two objects at the same time, thereby giving more time to cool.
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