This is a simple bumper. I use that for the tables and stuff that I make for the maternal school. I've designed and printed a lot of this for a luminose tables that I make with 0lab (www.0lab.it).
In the Instructables there are three kind of STL file. B1.stl, B2.stl and Bordo.stl. You can use Bordo.stl for print the bumber togheter with support. You can also use B1.stl and B2.stl for print the bumber in two times, separately without support.
For te print material, I use Colorfabb XT, or Colorfabb PLA. In the photo is visible also the table. This table have a light inside. It's a good idea for drawing.