I am in the midst of my second build and have been stalled/one step forward, two back on fret board slotting... I've been through three so far and learned: 1) Use a fret calculator, get the measurements and scribe them onto the board. I tired the printable kind and just don't trust it... it's a gut feeling, but that's my story and I'm sticking with it. 2) Measure each position FROM THE NUT - and avoid the dreaded 'error accumulation' situation 3) MEASURE TWICE (hell, maybe three, even four times!) Last night I committed to finally getting this operation done. I squared one side of my FB, clamped down my metric rule, carefully went down my fret spacing print out marking each position with my Xacto. Feeling really good about things, I began cutting my slots. I decided to go from the high end of the board and work my way back to the nut. Sitting in my living room and taking my time, I spent a few hours carefully sliding the FB into position, laying in the fret saw and cutting away. I cut the last slot, took the board outside to shake off the dust - came can into to admire my work and then I saw it... THE VERY FIRST FRET POSITION SLOT (2nd to last one I cut) was MIS-MEASURED!!!! Call it a version of dyslexia, but instead of it being located at 48.45mm, it was at 38.45!!!! AHHHHH!!!!!!!! I didn't see it as I was cutting because I was so busy paying attention to getting it aligned in my jig. Had I MEASURED TWICE, THIS WOULD HAVE NEVER HAPPENED!!!!! Now I off to purchase my fourth fretboard blank... The guys at The Wood Store are really starting to like me.