All full size saori looms come with a built in bobbin winder built right into the loom. This is a fantastic feature handy always close for winding bobbins but did you know you can spin and ply yarn on the bobbin winder as well? If you already know how to spin on a spindle or wheel or charka this is easier , however to take a class at a saori studio would help.
I used wool roving, un spun wool, and here and below some some cotton warp yarn I swept off the studio floor
no need to wind the yarn on a bobbin it is already on a bobbin just insert it into a shuttle and weave with fabulous results