Printed Windup Car, No Assembly Required, for 3D Systems PJ4500 Printer

A video of the windup car in action: https://youtu.be/4dcH0_db01o

This is a windup car which demonstrates 3 different types of printed-spring mechanisms:
- A large spiral mainspring (which stores the energy that makes the car go)
- A spring-loaded rotary ratchet mechanism (which allows the car to continue "gliding" once the mainspring has fully unwound)
- A front bumper mounted with a linear spring

I designed this 1 or 2 years ago to demonstrate some of the awesome stuff that the 3D Sys