cuttings in the fig7 design from small inlets 40 as compared to the main passage above them 38 another advantage is that the offset inlet 110 allows for particle arrays 116 otherwise on the periphery at circumference 112 to take up the slack of a missing portion of cutting structure at or near the periphery to still get effective milling at the periphery as opposed to locating the inlet in the center which would contribute to a no milling zone or a coring effect of milling the exterior of a downhole tool without the center those skilled in the art will appreciate that the improvements to the debris catching tool using the modular designs makes them more likely to come apart at the surface for cleaning when laden with cuttings that could be compacted a plugged cleanout 100 allows an initial attempt to flush the cuttings clear of a surrounding modular housing before undoing the set screws 98 to allow removal with a pull out force at the opposite end such as near the centralizers 96 the modular design can incorporate a flow path with a debris receptacle in each module and a sinuous path for flow coupled with sudden enlargements of the flow area where the bends are so that the reduced velocity will act with gravity to allow the debris to.