I designed this parametric mount to allow a dowel to rest easily atop a milk crate to provide a support for any filament spindle of suitable diameter.The part clips nicely and securely onto the rim of any milk crate. The dowel rests on top of this part and is held down by gravity. Future work: If I find that the dowel tends to migrate along its rotational axis while turning on these guides, I might add a piece to retain it, either as a separate clip, or as an integrated "lip" on this clip piece.While it is a direct derivative of neither, this work was inspired by rplumey's milk crate mount ( http://www.thingiverse.com/derivative:1335 ) for charlespax's cardboard spool ( http://www.thingiverse.com/thing:1550 ). Thanks!The OpenSCAD model can be easily edited to produce mounts for any crate rim width, rim height, or dowel diameter. When fitted properly, the clip should firmly lock right onto the edge of the crate. For this to work, it should be sized just right for your crate, so don't be shy about modifying the .scad file and exporting a new .stl to get that fit!Print two, then just clip them onto the rim of your milk crate, put your dowel / spindle on top, and relax!