UPDATE 8.11.2017:
Added a version for 58mm spools. So now there are 52, 54 and 58mm options.

UPDATE 12.10.2017:
Added version that works specifically with spools with 54mm inner diameter!
I just got one of those spools, so i had to update the model. Original part will work for 52mm spools

Here is a spool support that has a builtin bushing for the threaded rod. The spool support should now rotate freely without moving sideways on threaded rods and doesn't need nuts to stay in one place.

Print the spool support, twist the bushing using two prongs to liberate it, may need to use pliers. After this the bushing should rotate freely inside the main piece.

Feedback and suggestions welcome!