This was designed in openSCAD, simply to improve my very basic abilities using openSCAD

It is intended to provide a customizable spool centre adapter, with adjustable minimum diameter, maximum diameter & height, the option for any number of cutouts, or a solid cone & for 0, 1 or 2 bearings.

The cutout slots are dependent on the other dimensions

At present it does not do any sanity checks for diameters or heights that are smaller than the bearing, as I discovered that openscad needs new variables so that conditions can change values