This video shows the technique I use to fix those unwanted gaps between pieces when making an intarsia. Most of the video is in real time to demonstrate how long it can take to fix a gap. Some tips I mention are: Using a regular blade (what I mean by that is one that is NOT modified geometry blade). The blade should have a thin kerf. And placing the piece that you want to remove material on the right side of the blade. Hope this is useful for someone!
The shark pattern can be found at Intarsia Designs