I just got into 3D Printing (got my Ender 3 two weeks ago) and I've been loving the experience! Learning lots of new things as well as making a few mistakes and learning from those.
I found this model and wanted to print it for a fish tank:
https://cults3d.com/en/3d-model/various/fish-viewing-cave
In some of the Make screenshots it looks like the model doesn't have a bottom. However when I brought the model into Cura, it looks like the model had a top and bottom portion.
Because of that, I thought it would need supports so I went ahead and printed accordingly. When the print finished, it was just like the Make screenshots provided. No big deal, it was super easy to remove the supports. However, reviewing the model in Cura I'm not sure how I was supposed to know that it wouldn't have the bottom printed.
Thanks in advanced!
That is showing the model, but you can press the print preview button and it should show you how it will print. If that was just a superfluous polygon that wouldn't print, it'll show up in the print preview.