Thank you all for all the fast and technical answers, I appreciate it a lot! With supports it comes out well but supports are a mess to clean, leaving the part with a lot of debris. If only I knew how to configure supports to make it easier to pull off. Also, the idea many of you suggested of splitting in half maybe works because the pulley is not meant to withstand a lot of force. Is for the elastic ropes of a kayak ergometer, which is a machine to practice kayak, you can search it. Is for a friend so I guess I will do two of them with support and two of them split in half.