Simple spool bin stand.  I found that there are tons of designs out there for the bins, but very few actual stands to make them all fit together in organized fashion.  This is a stand with a 4mm thick base and walls.  The circumference of the spool pipe is 54mm.  This should be compatible with most brands, however I designed it to fit all the extra Creality plastic throw away spools that I've accumulated.  This prints in 2 pieces that join together by friction, with the ability to hold 6-7 spools.  I pretty much print exclusively in PETG, but I'm sure PLA would work fine too.  If you wanted to extend longer, the second piece with the insert flange could be printed and extended indefinitely.