These are two simple reels that I designed as reels for the pulley lift system my FTC team (11591) uses. We use 80lb braided fishing line. To attach, use a Tetrix motor hub with the bump towards the motor. Tie the string through the hole on the other side and you can start with it. The bigger one is more durable but it is, well, bigger. I recommend printing with 100% infill. You can print without supports.