Microjig Matchfit Makita 1/4" Router Guides - Relief and Dovetail Tracks

Once you have an initial relief groove cut you can use the relief guide with the Makita router plunge base to add more grooves at 4" intervals. (Swap out the original sub-base for the 3D print). 

Change to the dovetail bit, check the bit height and route one of the grooves with the relief guide. Then change to the dovetail guide, check the bit height and continue to make your final grooves.