First Print with the Simple - 3D Printing: Build your Own 3D Printer and Print your own 3D Objects - page 100

curve. If you're a painter's tape user, you may notice that the plastic sometimes
has a tendency to warp slightly as the plastic cools. The heated bed helps prevent
his. Be sure to check with your 3D printer manufacturer to see if a heated bed is
available; if you're the owner of a Simple, the heated bed should be available by
the time you're reading this.