This spool holder was designed so you could have one or add as many as you want. The top ring was designed to have the cyder inserted only half way in and then pined this allows for a second cyder to be put on the other side.

print a top and bottom for each side you need then bolt them to each other. Next print the cyder and pins. Insert cyder in to one ring then insert the square pin in top of ring. Place spool on cyder and then slide second ring on to cyder and then pin.