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Thanks for the warning: I will let the printer "sleep" this night and check for new versions tomorrow :-)

The 2 Kg spool is 30 cm in diameter. Its inner hole is 6 cm.

The spool with the large central hole has a diameter of 7,5 cm. If it is too much to get into a single nut I was thinking in an "adapter ring" that could be added to the current nut to extend its external diameter. This way the virtual "large" spool could be printed in two parts and actually used only when needed instead of having two types of nuts.

Thanks in advance for the 45° adapter. It will allow me to keep 4 spools in rather small box of 50cm x 30 cm. I will share some pictures when ready.