I was tired of having to screw and unscrew three bolts to change my fillament roles. It got the job done, but it was a pain. Also, printing the threads took a long time due to the required resolution. Thus I designed a simple snap fit spool holder rack for the standard fillament roles. This rack also supports the wider cardboard spools from daily (up to 9cm).
In order to print this thing, you will need to print the rack twice, and the rod three times. You can multiply the rod in most slicers if you want to print the rods all at once.
CATION: This rack does not work with the tiny filament spools that have holes of a diameter less than 3.2cm.
Almost any print settings will work just as well.