Prusa Mk3 Rear Storage and Clearance

I keep putting things behind the Prusa in the "danger zone" for being hit by the build plate as it moves.

So i created a tray the lightly clips to the back of the frame that fills the area that's required by the build plate. You can store things in the tray as long as they stay below the level of the edge. Or you can leave it with the "keep clear" visible so others know not to obstruct the printer or push it too far back against a wall or shelf.