It's assembled on 4х 608zz bearings.

Includes two roller

Long for 3kg and 1kg spools Short only for small 1kg spools

If you want to make something much more complicated than necessary, there is an option "decorative". Everything is modeled specifically for FDM printing and 100% printable without support on any printer of Ender3 level. But it requires that retractions, speeds and cooling are set correctly.

Print settings:

For Roller

Wall Loops - 4

Infill - 20% Triangles

Pattern for surfaces - Archimedean Chord

For Spool roller

Wall Loops - 5

Hight Range modificator 0-5mm

Infill - 30% Honeycomb

Top Layer shell layers - 0

Bottom Layer shell layers - 0