Additional shell design stls available here.
This 3d printed turtle uses the same flex concept from my Mini Monster Truck to create legs that allow the toy to bounce and scurry around when tapped. The head can also retract into the shell.
Check out my process for designing this thing here
The model assembles with the printed H-Clips and needs no glue. The parts print without the need for supports.
If you are interested in my design process and latest 3d printing experiments, check out my website and my Twitter.
This design will probably not work with a brim unless you spend time sanding and cleaning up the edges at the base of the print. This will stick the springs together and make the center channel for the head narrower. Using a raft might also affect this.
If you are having trouble with the head sliding, I have uploaded 3 head files with the stem portion scaled to be narrower:
Head95.stl - 95% original width
Head9.stl - 90% original width
Head85.stl - 85% original width