A foot to hold a filament spool, you will need 2 feet for 1 spool.
The openscad files have variables that allow you to size the feet for your spool and bearing hardware.
The default files are configured for small spools using M8 hardware and 628 bearings.
For 1 spool... Print 2 feet, and 8 plastic washers, you will then need the following (but modify for your own hardware preference)....
4 x M8 cap head screws (length dependant on foot size)
8 x M8 washers
4 x M8 nuts
4 x 628 bearings
This will make 2 standalone feet, you could also use 8mm threaded rod and tie the feet together.