One of my students is making a multi-scale instrument (Fan fret) and he (on his 4th build and a very competent woodworker) used the fret scale calculator at ekips.org to get it laid out accurately. The site allows for a paper template to be printed. All went well, template looked good and the slots were cut with great care and attention to getting them exactly as per the template. When time came to layout the fretboard on the neck blank to get the body join in position things seemed amiss.

Only cost in this case is a new fretboard and the time to cut the slots again. Lesson learned - Check the template is right before relying on it!
