Their are many different approaches to building a microtonal guitar depending
on players wants and desires in a microtonal system.

Below are two companies
that have microtonal necks designed in a number of different tuning systems
and from a number of different perspectives.

Freenote guitars and necks are
designed by Jon Catler and come in a number of different varieties. Below is
an image of four of the guitars available through Freenote’s website.

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Here’s a description from their site: With a revolutionary
new approach to the design of the guitar’s fretboard True Temperament delivers
an accuracy of fret scaling never before achieved in thehistory of the guitar.
Genuine innovation, and a radical new fretting technique, make it possible
to accurately implement any target temperament on the guitar, while retaining
full playability.

Mean Tone Blues

 

Well Tempered Guitar

Lehtela Guitar Craft-Custom builder
of Guitars, makes very interesting hybrids, the Sadari and Sitari The Sidari
Hybrid

Peterson Instruments-Glenn Peterson has built a number of Microtonal
Guitars, he’s currently working on a degree in Composition and not building
or repairing instruments