The stock Voron spool holder works, but I recently started using 2.5kg spools, so needed something for these.  This was the start of the rabbit hole I fell down sprucing up the stock Voron spool holder :) 
 

Changes I Made

• I created a 110mm version of the spool holder that works with the fillamentum 2.5kg spools I have, and made the stock one slightly longer too, so it should work with more 1kg spools (like cardboard ones, although I haven't tested this)

• Improved geometries/overhangs so the spool holder will print better, along with a little bit of of my own stylising :)

• Added more clearance to the mounting bolt so larger Allen keys, like Were ones, can more easily reach the M5x16 BHCS

• I also made a nice 2.5kg spool haha (I've included it in the CAD)