I acquired the following parts:
• One 3.7vdc 100ma Lithium Battery (https://www.adafruit.com/product/1570).
• One JST PH 2-Pin Cable (https://www.adafruit.com/product/3814).
• One N20 6VDC 150RPM gear motor (on line).
I 3D printed the following parts at .15mm layer height, 20% infill:
• Six "Arm.stl".
• Six "Axle, Side.stl".
• Three "Axle.stl".
• One "Base.stl".
• Six "Bolt, Axle.stl".
• One "Gear, Axle.stl".
• One "Gear, Motor.stl".
• Two "Side.stl".
Prior to assembly, test fit and trim, file, drill, sand, etc. all parts as necessary for smooth movement of moving surfaces, and tight fit for non moving surfaces. Depending on you printer, your printer settings and the colors you chose, more or less trimming, filing, drilling and/or sanding may be required. Carefully file all edges that contacted the build plate to make absolutely certain that all build plate "ooze" is removed and that all edges are smooth. I used small jewelers files and plenty of patience to perform this step.
The mechanism also uses threaded assembly, so I used a tap and die set (6mm by 1) for thread cleaning.
For assembly, I performed the following steps:
• Positioned "Gear, Motor.stl" into "Base.stl", then pressed the motor into the base and gear.
• Soldered the JST connector to the motor.
• Pressed "Gear, Axle.stl" onto one of "Axle.stl".
• Positioned the axle assembly in the base assembly, then secured in place with two "Arm.stl" and two "Bolt, Axle.stl".
• Positioned the second axle in the base assembly then secured in place with two "Arm.stl" and two "Bolt.stl".
• Positioned the third axle in the base assembly then secured in place with two "Arm.stl" and two "Bolt.stl".
• Attached one "Side.stl" to the base assembly arms on one side using three "Axle, Side.stl".
• Attached the remaining side to the base assembly arms on the remaining side using three "Axle, Side.stl".
• Secured the battery to the base assembly using double sided tape.
After assembly, I simply plugged the JST connector onto the battery connect, and off it went!
And that is how I 3D printed and assembled "A Simple 3D Printed "Walking" Mechanism".
I hope you enjoyed it!