This is my own design for a launcher link system for Beyblade X. It's HEAVILY inspired by other models I've seen, I just wasn't a fan of using PLA or PETG as it always broke on me from a hard enough launch. So I designed my own with other good models in mind and made these for TPU use! 
The actual link is oversized slightly to allow for a tighter fit in the launchers, keeping them from disconnecting.