This happens to me a lot too. If this happens, I normally just manually add supports on Tinkercad, or if that's too much work, I just don't do that model. I can't find a way to stop those lines, though, except for increasing the support line distance.
Well, I assume these floating supports will risk print failure from dragging loose strands or sagging overhangs if someone isn't careful and paying attention to how Cura is generating them.Edited by dodado
Simply block support for this hole, is not necessary.
I did a little more testing. With zig-zag set to 10% density, I was able to get rid of the floating support layers, but unfortunately it's an enclosed rectangle. I was expecting at least 1 side to be open to that it's easier to break it loose.
I also tested the line support, changing the density by 1% increments and each time gives really unexpected results of floating supports with missing layers. Only a few gave satisfactory results without missing support layers, but I could only do it with 1 line. Whenever there are 2 lines, the second one always has missing layers.
Link to post
Share on other sites