A banana-shaped modular spool holder for 1 kg and 3 kg spools.
It requires:
608zz bearings (4 per spool)
M3 x 8 mm screw (4 per spool)
M3 x 3 mm height heat inserts (4 per spool)
M8 smooth rod, any length (2)
The author remixed this model.
This model is otherwise identical, but uses 8 mm smooth rod in place of 12 mm.