Traxxas Slash - Shock - Lower Spring Retainer - V2

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.