metric ruler
thingiverse
A customized version of the design available at http://www.thingiverse.com/thing:109739 was created using the online Customizer tool found at http://www.thingiverse.com/apps/customizer/run?thing_id=109739. For your convenience, the following instructions are provided for personalization: position the text 18mm above the Y-axis and 3mm from the X-axis; use a ruler with metric measurements of 48mm in length; display numbers in a size of 7; set number offset to zero; and use a font size of 10 for optimal readability.
With this file you will be able to print metric ruler with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on metric ruler.