What are rafts and supports? Why do I need them, and do I need to pay for them?
Answer
A raft is the thin layer of filament that the printer puts down first for the best adhesion to the print plate. Design layers go on top of this, and is not part of your print. Supports are just as they sound, small posts that a program like Ultimaker Cura will add to make the print more successful for overhanging elements, like an airplane design (the wings will collapse without supports). As the library charges based on grams, rafts and supports will be included in the overall charge but are typically minimal as they are designed to break off and use less filament.