Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2340642.

Modified my own filament spool holder to add four cutouts so that it will accept both large filament spools with bores of 50mm plus (same as before), but it will now also accept smaller spools which have a small central bore attached with four ribs to a larger internal bore (photo attached in case that description is hard to follow!)

I recently made a spacer, allowing this to be used with spools that have a recessed central hub (like Flashforge spools for example): https://www.thingiverse.com/thing:3331563