Let's Make Robots!

repBug, 3d printed hexapod

Hello everyone !

After spending more than a year tinkering with my 3d printer, I am finally moving on to printing some fun stuff: hexapods! 


So these are the very early stage of repBug a reprapped mini hexapod:

Some features:

- open source design (will post the link to the github repository soon)

- parametric (modelled in openscad)

- relatively cheap (<200 euros, all included, hopefully)

- showcase the advantages of 3d printing

Some more details :
muscle: HXT900 micro servos ->9 grams each (X21)
brain : RaspberryPi or BeagleBone -> 30 g
skeleton: small 3d printed parts (PLA plastic), sturdy yet light ! -> 10 g per leg
eyes: small cheap chinese webcam , without casing ->3g


Overall design (far from final)

openscad view of prototype




Update 02/09/2012

First print tests :



Update 10/09/2012

3d printed parts
- I moved on to fully 3d printed servo couplings: all the parts that would require servo horns have now a toothed inner profile, and it works !! So this means : no more forcing leg parts onto shaft and damaging them, aswell as a lot of weight and complexity gained ! 
- redesigned /refined almost all the parts, making them as lightweight as can be, while still keeping them sturdy (usually 5 mm thick)
- created and printed a "testing rig" : just a few printed pieces and a piece of wood, to suspend a leg duo for movement tests 

- in the pictures you can also see the RaspberryPi that is going to be used as "brains" for size reference
- instead of going with a Pololu Maestro
(http://www.pololu.com/catalog/product/1356)I decided to use two  +Adafruit Industries  16-Channel PWM driivers (https://www.adafruit.com/products/815)
while this will take up a bit more room, and will require more hand tuning it gives me 32 channels for half the price ! 
- had a very big "do'h" moment when I realized I don't have enough rigid cables for prototyping even two servos :)

dual leg test rig

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Looking forward to see your process.

I'm curious about building a hexapod with the little 9g servos (using the same in a current project) and printed parts (just recently got access to a reprap).Good choice of colour for your prints, I was using the same/similar (orange PLA from faberdashery) last night to print something for the house. Please keep us updated and post a video of repBug's first steps.

Collected! When I'll get my 3D printer, for sure I'll build those legs! Thanks for sharing!