A spool holder I made using Sketchup.
I printed this using only 20% infill, however some of the top layers did not fill in completely so you may want to print at a higher infill percentage.
1 X 5/8"-11x12" Threaded Rod.
2 X 5/8" Hex Nuts
2 X 6203RS Ball Bearings (17x40x12mm)