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.
I don't know what controls Slic3r offers as to density, layer gap, type, etc. of supports. Both Cura and S3D provide a wide range of support controls that make it easy to remove the supports that are used. You could print the BLTouch wing standing up with the left side face down on the build plate. see the attached image, the bottom in this straight on view would be down on the build plate (red line represents the build plate).