E-step Calibration Ruler

This an e-step calibration ruler I designed that can be used even with a badly calibrated printer. The issue with most rulers are if your printer is not calibrated correctly then the results will be skewed. This tool compensates for this by using a printable paper ruler that's glued to the top. A quick formula reference has been included on the design however there are lots of automated calculators online you can use for free if you don't want to do that. Any correctly sized ruler in the MM scale will work with this design but I personally used the one listed in the link below. Cut and glue the paper so the "0" is flush with the top bar and use a marker to note the starting point.

*Printable Ruler*- https://www.printablerulers.net/preview/Ruler_15-cm_by_mm