About this 3D model

I needed a simple detachable filament spool holder and was impressed by the "Mendel Snap-in Filament Spool Holder" by rhmorrison, ( http://www.thingiverse.com/thing:22292 ) but I have a history of knocking spools off of my existing holder. The results of my thought process is this - a holder with latches to hold the spool shaft in place on the brackets and also to hold the brackets to the Mendel Prusa printer. I have also made a set of cones to cover the range of spools from 3/4" ID (Taulman) to 74mm ID (KDI) and some nuts which can be quickly cliped onto the shaft, tightened to take up play between the cones and then locked in place. Two more sets of these nuts have been fitted to locate the brackets to the top rail