Spool Rod Spacer for 5/16 inch or 8mm thick rod

Part of my filament path design -

This is a simple part that took a minute to design, but serves an important purpose. If you have a spool holder and need a spacer between parts you can size this according. The hole is 8.2mm in diameter. The walls are 2.5mm thick. I use on 5/16 inch rods but it would also work with 8mm rods. You can make it any length you want or print several of these and put them end on end.

Print it with 3 or 4 perimeters until there is no infill. It is 15mm long but you can unlock the dimensions in Prusalicer and make it any length you want along the Z axis. I made a few at 5, 10, and 15mm long for example.