Adjustable width filament spool holder for 2.2 kg (and other) spools

This spool holder sits next to your 3D printer. It can be adjusted to carry different types/sizes of spools (printing of a new central rod of appropriate length may be required). Apart from the plastic parts (print the a file twice and the b file once), you need two 10x19x5 mm ball bearings and 4 sets of screws/nuts/rings.