This is just a single-print and optimized print surface placement of the Sculpto Pro 2 Overhead Filament Holder (https://www.thingiverse.com/thing:4574024) by PearlGreyMusic (https://www.thingiverse.com/PearlGreyMusic) - all credits go to them. The shape or size of parts have not been changed.

I combined the two individual parts (base+roller) into one print file, and moved them close to each other at the edge of the print surface.

Besides the benefit of getting both parts finished in one print session, it was also because, in my first attempt on printing the original base directly, without manual placement, it overlapped the center of the print surface which caused non-optimal printing around the center. My first attempt also warped and detached from the surface after a few layers (because printing at center? because not clean? because no raft? idk) so a start-over was required anyway.

This single-print combination at the edge of the surface went perfect, took around 8 hours.

Mounting of the spool holder after printing:

1. Unscrew the original two screws from the top handle of the Sculpto Pro2.
2. Don't remove the handle!
3. Place your new Overhead Filament Spool Holder on top of the handle.
4. Align the screw holes.
5. Fasten by two screws through both the Spool holder and the Handle into the ends of the two metal posts of the printer.

Note: The original screws (at least on my printer) was not long enought! Requires longer screws than the original screws. Luckily I had some lying around. Another maker (https://www.thingiverse.com/make:1032192) said they used M3-.50 machine screws.