DARwIn-OP brackets and parts

by I-Bioloid, published

DARwIn-OP brackets and parts by I-Bioloid Jul 1, 2011

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He is a video that shows the process I have made so far.




These are parts to the DARwIn-OP. Which is a open hardware and software research robot.

CAD files are here:


Robotis website:



Videos of brackets being printed

Check out page 62 of Robot Issue 38 January/February 2013.

My article on this project is:

DARwIn-OP Cloning 3D printing—a case study—by Michael Overstreet

You can also check out Make Magazine volume #34, page 66 for more details on how I made the clone.


Video of all of the brackets printed out.


DARwIn-OP RoMeLa website:

RoMeLa (Robotics & Mechanisms Lab),
Virginia Tech

First videos of the robot in action.




Recent Comments

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Do you are using arduino to control it?

McMaster Carr is great but I had to buy 50 to 100 of every screw. Which got expensive. Robotis needs to come out with a screw kit.

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I should add that we are creating our STL files in AutoDesk 123D. I am starting to like this software more and more!


Here is a link to my instructables guide on how I made the DARwIn-OP clone for more information.


File Name



Do you are using arduino to control it?

I uploaded a test video of my darwin OP right leg. https://www.youtube.com/watch?v=Bld407HPdMQ

where can i buy the screws?

mcmaster carr or grainger has them usually

McMaster Carr is great but I had to buy 50 to 100 of every screw. Which got expensive. Robotis needs to come out with a screw kit.

are these parts scaled properly? i imported the head file and it says its only 10mm wide?

At one time they were but not know? I uploaded the same files that I used to print my DARwin-OP. I will fix and reload them.

Can you let me know from each items, how may time printing is required, please?

At least two of each.

Go to my instructable and downloaded all the assembly manuals for a detail parts list.


What parts are needed? What size and strength of servos? How many?

 The robot is design to use 20 DYNAMIXEL MX-28T. They are about 220.00 USD a piece. Yes I know they are expensive but they are awesome servos.

The UP! can now print with a .15 mm layer height! The covers of the OP are looking awesome now. Did not think that I could print them out! It just takes a long time for each print!

Will have a very cool update to this project in a few weeks!!!

I love the project but those servos are REALLY expensive

219.00 USD for a state of the art servo is not bad =-X

i just finished my phd in neural computation specializing in developmental knowledge representation and sensorimotor grounded language acquisition, and continually through my phd i kept thinking of how my project would benefit from having access to "real" sensiromotor data from a small humanoid robot instead of the simulated data i was using (and, of course, you have to start this way -- but it's nice to make the transition at some point). i was trying to price one of these out the other day, and really the $10k price tag seems like it's ALL servo. what makes them $220 each? is it the torque, or the digital interface with feedback? could you take a much less expensive but similarly torque-speced servo, and add on some small boards of your own design to give them the same functionality for a quarter of the price?

Peter have you priced robotic servos lately? Here is a write up on what makes the MX-28s so cool! http://www.hizook.com/blog/2011/06/16/new-robotis-dynamixel-servos-mx-28-sport-360-degree-rotation-and-4x-angular-resolutihttp://www.hizook.com/blog/201...

As for a cheaper version. Me and a lot of other people are working on that!! =-X


They are talking about making a DARwIn-OP with AX-12A servos! =-X