SeeMeCNC Rostock MAX v2 User Manual page 50

Support Material – Support material is used when the part you're printing has free-standing
features (like the chin on a bust) or another feature that requires it to be physically supported during the
printing process. When you check the Support Material box, the slicer will automatically design
support for the part that's currently (or will be) loaded.
Create Raft – A raft is essentially what it says, a "raft" of material that your part will print on
top of. Rafts are most often used when printing a part that is having bed adhesion problems due to its
geometry. For example, if you're printing a part that sits on small feet, a raft would come in handy if
the initial layers of the feet don't stick very well.
In the image below, you'll see an example of both support material and a raft.
Fig. 5.1-5: Support material and raft.
I took the little test cube and through a little manipulation, printed it tilted at 30 degrees. I took
this opportunity to also demonstrate what a raft looks like. This one is exaggerated in its size, but gives
a great example of what a typical raft will look like.
Rostock MAX v2 User's Guide
5 – Matter Control Basics: Slicing - 50