It’s good that the slicer warns about floating cantilevers and floating regions.
However, these warnings do not provide enough context; in particular, they don’t tell you the layer number(s) the problems occur in, which means you have to scrub back and forth through the layers trying to visually find the issue. And of course, you don’t know how many problems there are.
The slicer has to know where the problems are, so this information should be included in the warnings.
In my case, I ran into a floating region warning that turned out to be a non-issue when printing, and it took quite a bit of scrubbing to figure out what it was complaining about.
There are two ways to find the cantilever regions. First, you can enable support and slice your model. If you choose the “Line Type” as your Color Scheme, you can toggle the Support type on or off. That way, you’ll see what the slicer thinks needs support.
The second way to see unsupported cantilevers is to use the “Support Painting” button on the prepare screen. If you bump up the slider for “Highlight overhangs,” you’ll see them highlighted in red.
I think I can top the weirdness factor. I have a part I print, slice it, zero issues. hit “Fill Bed with Copies”, and the 2nd to last one (long skinny parts, they end up 6 across the bed), ends up with the floating cantilever problem, but parts 1-4, and 6 are fine. Delete part 5, slice, everything’s fine. How can it be a problem in the part when it’s the slicer cloning a part that has no issues that it detected previously?
Another way to identify these floating regions is to select the item, choose Supports Painting (nearish to the right side of the top row of icons), then slide the “Highlight Overhang Areas” slider to see the areas that may need support. It’s helpful if you use the mouse to swivel your design to see from the bottom up.
So I tried the recommended ideas to find the floating cantilever, but I never saw the issue. I have printed this part out on another machine and there was no issues, so I am just going to have to try and print it out and ignore the issue. Thankfully it is only a 2 hr print. So, after printing it was just fine. Not sure if the software has the issue or if the print has an issue, but it came out just fine.
I ran across this topic and couldn’t figure out what the issue was, so I started my print anyways. Well, I figured out my issue after watching the first layer and a quarter print. My model was about 0.25mm above the build plat in bambu studio. No obvious supports were added, only some brims. It was obvious when printing - the first layer was only the brims, and the second layer was on the brim and off of it - the part that was off the brim was printing as “spaghetti”.