Universal filament spool holder

This filament spool holder will accomodate both 2.3 kg and 750 g spools. I like it much better than my earlier design thing:4194882. Minimal design, maximum function! No glue required, everything clamps in place, although I had to use a hammer to make some parts fit. Besides the printed parts (4x part a and 8x part b) you need 4 skateboard ball bearings and 4 aluminum rods (8 mm diameter, 2 rods of 12 cm and 2 of 16 cm). The 'a' parts have a slot of 6x26x1 mm for rubber feet to stop your printer from drawing in the spool.