Filament pulley

Because I don't want to have the spool holder that came with my printer on the floor, and because my cat has cut the filament twice when trying to climb the printer, I built the spool holder from https://www.thingiverse.com/thing:454808, ant then the filament guide from https://www.thingiverse.com/thing:2042351.

You may see in the picture of the top of the printer these two pieces

All the descriptions suggest to invert the filament feeder stepper but I do not want to do it. So I decided to