This is a modified version of the stock Makergear M2 spool holder. I really like the stock spool holder because its strong and holds the spool in place well. The only problem is that it is really short. So I made two versions. One that is long enough for narrow spools and one a bit longer for the thick squat spools. I did my best to maintain the overall geometry of the holder so it isn't just a stretched version of the spool holder but one where the center section was lengthened.
They should print fine in either ABS or PLA. No supports needed.