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by matthiasm May 9, 2009
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how thick is the material used?

3mm HD foamed ABS. But other sheet material would work just as well. The ABS was a bit too bendy and I had to add diagonals in the upper legs for reinforcements. It could probably be built in birch plywood or even HDF/MDF.

How big is this? the 3D printer I have access to is only 5X5X5

This is not meant to be 3d printed. You can cut the pieces on a laser cutter.

I woulld love to print this. How could I make these files into STL's?

Well, it's meant t be laser-cut from flat material. You can still print it if you take the 2D dxf files and extrude them by 3mm in a 3D program and print that out.

they are not compatible with Cura, so could you create stl 3d parts and put them on package?

Again, sorry, the parts are not 3d printable, but meant to me laser cut or CNC machined.

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Very cool! I am thinking about building something similar for a school project. Thanks for posting this! I bought the ABS yesterday and am making a few tweaks to the design so I can fit some of my servos in. I am also thinking of modifying two of the legs so that they can also be used as manipulators.

Making the thing is easy, making it walk less so. Making it walk and respond to tactile feedback is near impossible.

That's beautiful and very generous of you to share.

I am very seriously considering making this on my school's laser cutter. How much was spent on the motors and electronics?

Awesome. The servos I used were about 12EUR each (you need 8x3=24). The electronics I developed myself and cost about 30EUR. The battery was 20EUR. I had the pewter axles machines for about 0.75EUR each. Plastic disk and rivets, screws etc will probably cost another 20EUR.

There are a lot of places where I cut only 50% of the material. Something you cannot do with a laser cutter. The parts will still fit, but you shoudl verify that the axle sockets still work as planned and update the CNC files accordingly. You will also find a bunch of 2mm arcs in the cutouts. These would not be needed for a laser cutout, but they are not harmful either.

Good luck, hav fun, and feel free to contact me if there are any questions.

I'd love to make one of these! I was curious; Would you happen to have these files available in EPS format? The application I use for my router tends to change the physical size of the files, and I need something to reference by. If not, its all good. Ill make it work :D

-- Sorry, it changes the size of DXF formatted files

How strong of servos do you need for this design to work well? I imagine it would not work well with low-torque servos.

12 kg cm is recommended. My servos have 10 kg cm and just do it.

This is so awesome! A must-build!

Impressive! I'd really like to build something based on this design. And by the way: what is "foamed pcb" and where do you buy it?

Um, I meant ABS. Tsk, tsk.

Ah, thanks. The cuts are neat with impressive laser-cutter-like sharp corners. What kind of bit did you use, and did you cut the whole design with the same size bit??

I used a 2mm bit for the whole thing with two cutting edges at a 6000 rpm and slow advance (lame router...).