This is a holder for the coppertape rolls we use often. They unroll themselves and become a big mess. The rolls have an inner diameter of 70mm, outer diameter of 130mm when full, and a width of 5mm.
You can speed it up to 200% printing speed while printing the circle, but then you will want to slow it down when it gets to the sticks/clamps.
Put in the roll, and slide the tape through the right hole. The two holes go in opposite directions, so you can pick the one that fits with how you put the roll in the holder. Then snap the pieces together and you're done.