Nice Roll Top Box.
When the box is opened, the lid hides in a space between two "walls" at the bottom of the box (see photos).
10 X 5 X 4 cm
To print the lid (roll_topbox-_cover.stl), rotate it in a way that the first layer is longitudinal from the body of the lid. Print it without raft.
For my Rapman 3.1 printer, for example, I rotate de lid 45 deg so the frist layer will be longitudinal.
Print the roll_top_box_2parts.stl file without raft, carefully position the lid in the biggest part and glue the 2 parts of the box, done (=