CO2 Dragster Launcher

CO2 Drag racing cars are great fun but launching them without the proper equipment is frustrating.
I have designed a a simple mechanical alternative to the solenoid launcher used by F1 in Schools during competitions.
The launcher has been designed to be almost entirely 3D printed.
As far as possible, the parts have been designed to use little or no support material.
A few additional items are required. They are easily obtained from your local hardware store.
Here is a video of them in ac