The 3d print part should be quite independent from the arduino robot piece. When I was working on my hexapod, I started working on the mechanics using tongue depressors as legs.
Then I stepped up to thin plywood.
Then I ordered nice plastic legs.
But there was a fair amount of head scratching and programming to get it working.
You won't want my sketch. It is a jumbled mess and was never completed.
But there are a lot of people here who would help you develop your own!
Edit: And now I see your link. 12 servo quadrapod.
@casperack, when you have looked that project and downloaded the 3D plans,
start a thread with your progress and questions.
I would like to see someone doing this.
I was surprised how smoothly his quad walked. Usually they tip back and forth as they walk.
I expect that a PCB is down the road a bit.
Get your arduino to talk to your servos.
Get all of the power requirements and coding issues out of the way.
Likely use a solderless breadboard to begin with.
Maybe use a solderable prototype board once you get it walking.
Then look to clean things up with a PCB.
Oh, the power bank. It is a regulated power supply (with an internal dc-dc piece)
But 5V so the nano can run directly on it.
I would say that it is likely marginal for powering 12 servos, but it obviously works for him.
Here is a pic of how he wired the 12 servos. It would be interestint to see the back of that board to see the wires, but I am sure that all 12 serovs have +5 and GND from the power bank, and the signam pin on each of the 12 goes to one of the pins on the nano.
Do you have servos?
Do you have a Nano or Pro Mini?
A Power Bank?
A USB cable to cut up to grab power?
Ahh, here is a glimpse of the back, from 2:17 in the video.
First shot without arrows
Second shot with some arrows.
Green arrow pointing at one row of pins all joined together.
Blue arrow pointing at the middle row of pins all join together.
Purple arrow pointing at the row of signal pins, each one with a wire going sideways to the Nano pin.
I think that the UNO, a power bank and a way to wire up all the servos should be good.
This makes an assumption that the power bank will be capable of providing enough current. The math says it might fail. But clearly the video shows it working.
Are you going to do this?
It would be a fun exercise.
ali express has 20 servos for $23ish
I may go experiment with wiring up 12 servos to one of the UNOs I have laying around.