One of my spring retainers went missing at the track. I decided to make a replacement instead of buying one. Notes: 1) This is my first attempt at 3d modeling. All feedback is welcome! 2) I have yet to test this at the track, so I can't guarantee durability. 3) Some areas of this model are pretty thin so it may not print well in all printers. I used Makerware on the High profile with the Raft option enabled I printed this using a Replicator 2.