I noticed that most people had some space on their MFT rails, especially on the side, so I thought of this little motivational sign that fits right into the rail and dogholes. Kept it rather small (2 dogholes) in order to be printable on smaller printers.
This is meant to be printed face down with the first two layers in black and the rest in green so that the text is easier to read. The arrow just slides on the MFT rail (0.5 mm clearance)