MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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simplify 3d might be the solution to your circle problem.... was causing me lots of trouble in any version of cura I tried. granted some of the tubes I was attempting to print were relatively small, but the difference between the two slicers is like night and day. I am using it more professionally so the cost was justifiable to me, if you're just tinkering it may not be worth it to you. but the improvement in print quality and the method of working is much more effective in my opinion. but i swear i tried everything to fix those circles in cura...