and try a print with 24% infill, it looks less material, but the infill is printed in both directions on each layer.
Thanks for the suggestion. We usually left the print settings on the 20% defaults. The reason we switched to 25% is precisely because the algorithm works differently from thereon onwards. Be it as it may, both algorithms used to work flawlessly, and we could set the infill rate based on our requirements for structural strength, not to force a specific algorithm.
As in the reply to Nicolinux above, I have a suspicion that the nozzle or the feeder is damaged. I trust that if there was a flaw with Cura it would have been discovered and fixed by now.
Perhaps I should also try other slicers (it just always seem like such a schlep to get them working for the Ultimaker), as you suggest the algorithm could make such a huge difference - will keep you updated.
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thinusp 1
I'll definitely give this a try; the intent of course being to slow down the printer during infill and such.
The latest version of Cura gives you the option to copy the settings when you switch over from "quickprint" to "full settings". When I do this, the infill speed for example is set as 80mm/s. The print speed is 50mm/s (for normal quality). This reduction does not seem big enough to make such a huge impact, but it is worth a try.
After playing around a bit more over the weekend, I have a funny suspicion that the feeder stepper motor is skipping or something (motor problem, not with filament slipping or similar), or perhaps the nozzle has been damaged. I've already ordered a replacement nozzle.
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