Summary

I was just looking for a simple spool roller and the origin thing was just fine. No need for other hardware, just some M3 screws and some 608 bearings which I had.

But, I needed a roller because I had some old Octave filament spools that I wanted to use up and they are 90 mm wide, and I couldn't find a spool roller to fit those.

So in the slicer I split the bottom plate and widened it by 20 mm. Same for the length of the roller. I also increased the X, Y of the roller by 0.2 mm to make the 608's a nice press fit.