Very small Spool holder, Easy to print, Fits literally every Spool.
Assembly: - Print the .stl twice - get a threaded M5 rod and cut two pieces the length wich fits you (see pictures) - get 4 GT2 pulley wheels 20T without teeth, 5mm Bore like those: www.amazon.com/WINSINN-Aluminum-Timing-Toothless-Printer/dp/B07CCMQ8T7 - Assemble it like the pictures above
Make sure you only fix the wheels on one side (left wheels are fixed to the left in picture above) the other side should be slideable over the M5 rods to hold different spool-widths. Of course all 4 wheels should rotate freely!
If you get wider spools you can always use longer pieces of threaded M5 rods