Remove unneeded part of object

[PerformanceRaceServices 0]

I have trying to created the attached art piece but when I load the STL file that I was given from the art designer CURA wants to add a bunch of unneeded material (see the before photo and the sliced photo).  Any help in how I can remove the unneeded parts?

[gr5 2,331]

The teal stuff is called "support".  There is a checkbox you can uncheck to disable support called "generate support".

 

Or you can disable just portions.  It looks to me like you definitely need a little bit of support on those "posts" that hand downwards over air.  You can't just print over air with most 3d printers.  So there are lots of features to add/remove/tweak support.  In this case I would probably use the support blocker feature.  Watch a youtube video - maybe search "cura support blocker".  The way you do it has changed over the years but it's extremely similar and won't have changed much.

 

First step is to click to add a single cube of support blocker.  Then select that cube and scale and move it in 3 dimensions to get it to enclose all the red areas of your model that don't need support.  Support blocker is a bit confusing as people put the blocker down on the bed where they don't want the support.  Instead you need to put it over the red areas of your model (areas that are red in PREPARE view).