The Depth Bias is used to calculate the properBlade Depth when the SKUselected for the matboard contains the Matboard Thickness. If the Blade Depth is cut Too Deep, Decrease the Depth Bias. If the Blade Depth is cut Too Shallow, Increase the Depth Bias. The formula is: [(Default Depth) - 10] For example, if the normal Blade Depth for 4-ply is 11, then 11-10=1, so enter 1 for the Depth Bias.  See: Depth Bias Function | 