This is type 3 of the Claw foot walking mechanicals. This version uses a cam and a crank action too provide a walking system that does not raise and lower the body or tip the body when walking. So it is very good for solar powered walking robots. It uses a low cost DC gearbox type motor. This unit does not have a body so to show operation I attached a two AA battery box with built in switch to the frame. A few screws and washers are also required.
I just added a NEW Motor Small gear STL file. It has the D slot running all the way threw so that gear motors with a longer drive shaft can still allow the gear to push all the way on.

Prusa

i3 MK3

No

No

0.2

20

I designed the parts in Design Spark Mechanical. Here is a you tube video to show the functions and the build.
https://youtu.be/Pfw_jybhvHU