I have a Friendly Loom in my textiles center in my K-2 building and 3-5 building. Last year, collaboratively, intermediate students only completed one weaving, and left four not even half done. I was disappointed that it wasn't getting more use. Card-loom weaving has always been popular with the kids, and I personally enjoy weaving very much.
I previously kept a box of yarn, fabric scraps, and scissors in the textile center. I wrapped the warp, and taught the students how to choose and begin their weft. At the beginning of the year I had started each weaving with a mock-shuttle. The shuttle would last for about one kid. It was a total pain too because I cut them out of mat board with scissors - yikes. To conquer that mess, I hung up pictures and showed the kids how to wrap a butterfly bobbin to get themselves started. This did not work at all.
Most students preferred to cut their own yarn (too short) and just begin weaving. The fabric scraps confused them and the color schemes and patterns were ugly. The students did not like what another kid had previously wove. The textiles center became a knotted mess.
Starting fresh this year, I wrapped the warp on my Friendly Loom into four new weavings. Next, I spent about 20 minutes or so wrapping shuttles. I cut 2" by 4-5" mat board scrap and wrapped the weft thread around it. I chose my thickest yarn and only used a handful of colors. I read Tumblr and talked with coworkers as I did this, so it was pretty painless. I started one shuttle and left the rest (with ends taped) in a bin by the loom. I will not bring out any more yarn till these shuttles are gone. I will also not have any fabric strips anywhere near the Friendly Loom.