Sleeves for hollow core filament spools

thingiverse

This is intended to be used for spool holders with bearings in them. Many filament spools are cardboard now which means the core is hollow. The hollow core spools can't ride on the bearings. These inserts help with that problem by adding 25mm on each side so the spool can ride on the bearings. They are split on one side making them adjustable for most size cores. Edit: A second file has been added with the same object but with a wider slit to accommodate a smaller core size on the spool.