I am really new to CBG building but I have designed and built many things in my life. Thought I would share this method of marking and cutting frets that I came up with (apologies if this method is already known and used).
Using the Stew-Mac calculator for data, I lay out the finger board using Microsoft Visio (any drawing program that allows you to enter numerical data will work).
The next step is to print this out one-to-one on a laser printer. The heat sensitive toner is important.
Cut out the guide and tape it printed side down on your finger board.
Press the paper with a dry iron set to the Cotton setting. This will transfer some of the toner to the wood.
For cutting the frets I have found a small hobby miter box most useful (won't work for really wide finger boards).
I have cut four finger boards using this method, the last two with the miter box and that tool made cut the time in half.
I have attached a PDF file with four Uke fret layouts.
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I've been taping the paper to fretboard then using a small square to score across the lines with a knife.
That's pretty much the same way I do it... just finished one last night