Oh - and if slowing it down fixes the problem and you never used to have the problem (as you say) and you didn't slice with a newer version of cura then the problem is most likely related to the nozzle anyway and just has some buildup which gives it extra pressure and printing fast (higher pressures) is what tends to cause these bumpouts.
So instead of using a larger nozzle (I strongly recommend that for this part!) you could just burn out the nozzle to ash and maybe also soak it in acetone overnight and maybe also do a few cold pulls and maybe scrape the nozzle a little with a nozzle cleaning tool (what country do you live in as where to get a good nozzle cleaning tool varies by country - please update your profile). Or just buy a new .4mm nozzle from 3dsolex.
Edited by Guest
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gr5 2,295
Try printing at half speed. It sounds like you are printing lots of these and want to print them fast but just try it. Actually try 20mm/sec just to see if this fixes the problem.
Most of the time cutting the speed in half will get rid of these bumps. If you printed multiple of these parts on the same print bed then it could be a leaking/stringing issue but that's not what it looks like.
Also check and make sure the infill speed is the same as the print speed.
If you want to print this faster, use a .8mm or 1mm nozzle - because there are no sharp corners you will loose no quality and you can print in half the time with the same layer height and print speed and you can probably speed it back up again (less pressure build up in the nozzle with larger nozzle).
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