This is a combination square like ruler that is extremely useful in woodworking. I packed it with as much features as possible. Also it is fully customizable. The ready build model is 20cm long, you may want to rotate it 45 degrees for it to fit your print bed.

I recommend printing this with a high stiffness plastic. I find natural PLA to be a good fit as paint in PLA generally softens it.

I have printed 3 of them and one day will upload them...

Make sure your printer is well calibrated, sometimes due to steps/mm value being integer, your printer could have a small error. This error accumulates over 200mm and ruler will be off. This was the case in my printer. Just print a very thin box of with 200mm and scale the model accordingly (I had to scale to 1.004 to get it perfect).

Note: If you wish to modify the design OpenScad file is included, you could change all settings, including size and pen(cil) holes. If working, you could use customizer right here on thingiverse, if not, download and install OpenScad and modify the parameters from there.

Edit: I have added two imperial ones, with 1/16 and 1/8 steps. They are not tested and the customizer still cannot create impertial rulers. If there are any issues let me know.

Edit 2: I have added imperial scad file along with more imperial versions. Thin version has rows per inch and thus thinner. There is also a thin 6 inch version.