Ukulele nut intonation fixer

Bought a cheap Ukulele that doesn't sound in tune after tuning it? There are lots of reasons that could happen, but this replacement nut will fix one of the reasons. Intonation is the accuracy of the pitch of the instrument, by the way.

First to know if this will help, tune the ukulele while pressing a fret, instead of on and open string. If most of the fretted notes are in tune within a couple of cents, but the open string is out of tune, this will fix that problem. My first exposure to a fix was a [blog post](http://nyarlathotim.blogspot.com/2012/12/fixing-intonation-on-crappy-ukulele.html) suggesting jamming a toothpick next to the nut. That does a surprisingly good job, but this is a step better because by the time you're done, each string can be customized to perfect tuning.

Tools
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This was done in OpenSCAD and you will have best results if you just install it, rather than trying to use the thingiverse customizer. Open the file, edit the parameters as directed below