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 Systems ProJet 4500 can do with thin, flexible features. It requires no assembly, and can be printed in full color if you wish.
Perhaps it would also work on an SLS printer? I'd be very curious to find out!
Enjoy! If you want the SLDPRT file to tinker with, shoot me a message.
This design relies on the use of thin features to create the springs,and these will require extra cure time. After you print the windup car, let it sit in the printer for 24 hours before you depowder and remove it. The springs need the additional time to cure in their resting positions before they are removed from the support of the uncured powder.
After that, make sure to depowder the clearance space between the axels and their bearings.
For post-processing, I recommend leaving the car as is. In a pinch though, I think you could use the low-temperature soy wax process to make the colors pop. I believe that process is outlined in the 3D Systems best practices document for the printer. Beware, the heat of the process might cause the springs to "droop" a bit.