Any size rule slide attachment

Use customizer to custom fit to any size rule.

This can measure length of 2 random points such as the back of picture frames, extension leads, towel rail etc.... and transfer the hole centers to wall for drilling.

It also can be used as a height gauge / comparison. Please note if using as a height gauge make sure your rule graduations start from the datum edge and not as a ruler does which start slightly in from the datum edge. (that's the difference between a "rule" and "ruler")

Another use is as a "L Square" drawing aid to draw parallel lines or reading data from tables.

The fit needs to be an interference fit with your rule.

I recommend printing this vertically as shown in the STL file
This is a quick print thing, I recommend you do a test print by stopping the print a couple of mm in height and test the slide fit with your rule then adjust the parameters in OpenSCAD or customizer and reprint and after a couple of attempts you should get a nice sliding fit which gri