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Coasting is the probable culprit with Combing a close second. If you are using them both it's a tie.
Coasting allows the pressure in the nozzle to fall off as the head decelerates. It makes for a nice finish on skins, but causes under extrusion when it gets to the next move. If there wasn't a retraction between the end of a coast, and the start of the next move, then there is no prime and so your "Extra Prime" didn't work. You'll notice that Coasting is in the "Experimental" section.
Combing is usually preceded by a retraction but long combing moves can allow enough drool that the prime isn't quite enough to get started on the next extrusion. Extra Prime can help in that case, but it does the Extra on every prime, not just those that are after long combing moves.
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Here comes Cura 5.9 and in this stable release we have lots of material and printer profiles for UltiMaker printers, including the newly released Sketch Sprint. Additionally, scarf seams have been introduced alongside even more print settings and improvements. Check out the rest of this article to find out the details on all of that and more
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GregValiant 1,411
Coasting is the probable culprit with Combing a close second. If you are using them both it's a tie.
Coasting allows the pressure in the nozzle to fall off as the head decelerates. It makes for a nice finish on skins, but causes under extrusion when it gets to the next move. If there wasn't a retraction between the end of a coast, and the start of the next move, then there is no prime and so your "Extra Prime" didn't work. You'll notice that Coasting is in the "Experimental" section.
Combing is usually preceded by a retraction but long combing moves can allow enough drool that the prime isn't quite enough to get started on the next extrusion. Extra Prime can help in that case, but it does the Extra on every prime, not just those that are after long combing moves.
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