Spoolholder i made for the tronxy x5s, it mounts in to the 2020 and 2040 profiles at 2 diffrent locations.
2x 625zz bearings
3x m4 T-nuts
3x m4 bolt (for T-nuts)
6x m4 bolts (the roller holder assembly)
2x m4 bolts (the bracket that mounts to the 2020 profile)
2x m5 bolt (for the bearing/roller assembly)
If you do this upgrade you should also print my extruder holder to relocate the extruder to the middle right over the spool. (https://www.thingiverse.com/thing:3410505)