Summary

remix of tripod
12 servo
30 grams, printing time 3 hours

Thanks to all other person design;
Main parts
Tripods are coming ... by Ablapo
https://www.thingiverse.com/thing:61949

Leg.stl
3DOF Mini Quadruped by tmbg
https://www.thingiverse.com/thing:50125

Center.stl
This thing was made with Tinkercad. Edit it online
https://www.tinkercad.com/things/lcS1f9Pqic8

Shematic
Lelf Front connect to pin D2-D4
Lelf Back connect to pin D5-D7
Right Front connect to pin D8-D10
Right Back connect to pin D11-D13
Arduino Nano, Vin and GND to 5V +/-
Servo VCC(red) and GND(brown) connect to 5V +/-
use LM2596s voltage regulator for other batteries

Work the same way that
Regis Hsu's Spider Robot...

Code
spider_robot.ino.txt
open with wordpad, and then change extension
Or copy to your arduino sketch

Download Libraries from:
https://playground.arduino.cc/Main/FlexiTimer2

The Instruction guide
http://www.instructables.com/id/DIY-Spider-RobotQuad-robot-Quadruped/

remote control
http://www.instructables.com/id/DIY-Spider-Robot-PART-II-Remote-control/

Alternative legs
Easy plug SG90 Spider Robot
https://www.thingiverse.com/thing:2730437
(remix of)
Spider robot(quad robot, quadruped)-SG90
https://www.thingiverse.com/thing:1009659
other remix:
Spider robot(quad robot, quadruped) repaired
by mirox3m
https://www.thingiverse.com/thing:1399600

I made some extras
https://www.thingiverse.com/thing:2853153

Alternative wiring
https://www.thingiverse.com/thing:2440237
Spider Robot wide body for Nano expansion board

Remix of wide body for MG90 servos and Nano expansion board
https://www.thingiverse.com/thing:2825097

remix made by anoochit
https://www.thingiverse.com/make:161883
Add more Feature to robot