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Old 15th May 2019
  #845
Gear Addict
 

For a fractal diffuser I would use a small diameter straight router bit instead, Ø 6 mm or 1/4" or so is easier to control than larger bits and also less risky to operate. Together with "shims" in suitable thicknesses + a straight piece of wood along the side of the router machine, you can controll width and depth of each part of the diffuser front. Insert shims one at a time to widen the groove. Reset the bit depth when one groove is done and start with the next groove.

With a good table saw with a height adjustable blade, a straight edge + shims you can do the same. Clean any debris in the groove with a chisel.