Roller ruler (parametric with optional screws)
thingiverse
This is slightly modified version 5hwb's Roller ruler (parametric) https://www.thingiverse.com/thing:398515. I had problem with axes snapping so I added option for screws (and even screw pin in measuring wheel). My axis screws are M3x20 and M4x6 for pin. Also there is now option for double digits on second wheel - so you can read numbers up to 99cm (as long as your guess of the length is not off by 50cm ;) ).
Download Model from thingiverse
With this file you will be able to print Roller ruler (parametric with optional screws) 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 Roller ruler (parametric with optional screws).