MeArm - Your Robot - v1.0

by phenoptix, published

MeArm - Your Robot - v1.0 by phenoptix Sep 1, 2015


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MeArm is Your Robot. Designed to be easy to build and share the MeArm has been called the world's first viral robot, having been built on every continent except Antarctica.

Available to download here to build your own or as a kit at our store in the UK
The Hackaday Store in the USA.

MeArm is a Trademark of Mime Industries.

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Is it possible you could export the pieces to .stl files or the .dxf to a valid .svg?

Comments deleted.

hi is that possible if i can get a copy of mecon controll software??

We've got lots of experience using Coreldraw for our own laser-cut projects. It's a fine tool for designing, albeit not quite as good as a proper 2D CAD package like AutoCAD LT (or anything modern). I used to train operators in AutoCAD (V14 was my last experience, a lifetime ago), and there's some 2D features I sorely miss, but have work-arounds for in Corel X6. It's still a very capable tool for this purpose.

The problem with Coreldraw is that it does have a messy DXF exporter. Proper arcs convert to multisegment lines causing file-size bloat and inaccuracy. It's such a PITA, that there's some 3rd party plugin software that handles it MUCH better, but is exorbitantly expensive.
Exporting as a PDF file or EPS often does a better job than a DXF in Coreldraw, maintaining proper curve definitions.

Looking forward to trying out a MeArm soon!

Amazing work. I think I will use it with kids next year with ardublock.
I only have one problem, I cannot find the thickness of the plexi. 3or 4 mm ?
Thanks in advance

Amazing work. I think I will use it with kids next year with ardublock.
I only have one problem, I cannot find the thickness of the plexi. 3or 4 mm ?
Thanks in advance

Hello , you could upload a file .cdr format to make the cut on the machine . Thank you

Comments deleted.

Hi phenoptix, could you upload the PDF format such as had commented bellow and in "instructables" web.


Hi guys,

Based on the info on this thread I decided to give a shot at modifying the design files for printing. I am planning to teach a class on robotics, and I need to bring down the cost to meet the school budget. We have bought a kit from MeArm, which is what the teacher will be using, but we want to be able to print many spare parts for the kids.

I have uploaded the modified files here: https://github.com/jcard0na/mearm
I believe that this work is compliant with the CC-BY-SA license and, more importantly, with phenoptix intended use of their design. But if that is not the case, please let me know and I'll correct right away.

I have not yet received the Ponoko printouts, but when I do I'll upload pictures the the github site.



Easier, I have converted the .svg files to .pdf. From chrome (or other navigator), print, option save to pdff.

Now, one question. What is the source of the svg files (.dxf?) ? I need to know that before to cut that.

Comments deleted.

Why does a file like that have 4MB?? I estimate with straight linear lines and circles this parts are done with 200 kB.
Phenoptix this is suboptimal. Is this some kind of marketing strategy making the DIY complicated to sell more kits
because people give up on DIY-cutting? Or is your CAD-Guy a lazy one?

I design these in the flat in corel draw. I don't use 3D cad. What I share is what I use to cut the MeArms.
There's no conspiracy or marketing strategy.
You're a smart guy, make a more optimised version and share it, instead of putting your energy into whining in the comments section. You seem to know more about cad than I do, I just wanted to make robots and used the tools I had to hand. I'm learning along the way.
Please do me a favour and share something though, currently you're just moaning, it doesn't appear you've added anything to the positive to the world and you're telling me what I've done isn't good enough for Open Source (see comment on MeArm v0.4).


first of all you made a great job designing the MeArm and improving the design. You are right I should not only critisize.
I'm sorry for beeing some kind of rude.

I started to modify your DXF-File and have some questions:

Is there a special reason why the wholes for screws are flatened at one side?

If I import your DXF-File into QCad V some lines look different than in the assemby-manual.
QCad seems to have a problem with some of the splines. Could you upload some other fileformats like HPGL, SVG?
I would like to try a file-conversion from HPGL and SVG to DXF to see if the result is correct.
Even a high-resolution PNG-file would help. InkScape is able to vectorize pixel-images.

QCad is a 2D-Cad-Software. I would call it the right tool for smaller constructions like the MeArm.

3D-CAD-Software is overloaded with a lot of functionality. This is the reason why it takes so much time to learn to use them.

QCad has all the real important things but is not overloaded. It still needs time to learn it. But the timeunits measure in hours not in weeks. I'm not very familiar with Corel Draw but I guess coreldraw has functions like "catch endpoints, midpoints of lines,
catch center of circles, draw horizontal lines, draw vertical lines. etc.

If you were doing some more constructions in the future I estimate there is a good chance that you will be more productive with a
simple CAD-Software like QCad. The investment of practising 10-20 hours with QCad to learn it will pay back.

best regards


I opened the .dxf file in both inkscape (open source, free) and Adobe Illustrator CS6. There appears to be problems with the file. The most notable issues are parts 26 and 29. It is possible that part 29 is legitimate, if the idea was to refine the cut near the flatted circle.Part 26 may be just shifted, however it looks like is is missing a path point. I also noticed that the scale to enlarge the drawing to 300x200 mm is different for the x and y axis, which is most likely not a good thing.

Has anyone else run into these issues?

i had the same problem, so i went and dug around for the manual and they have a pdf version of the parts there. rescaled it and did some minor editing. gonna cut it out on monday and see how it goes.
dxf 26 is broken, the spikey thing should be a nice curve. 29 is how it supposed to be from the looks on the manual, it's attached to the servo gear plate things

i actually had no problem with scale enlarge, just import as cm and it was fine for me...

but yeah. got the pdf, gonna try cutting it and build it in a few days

Nice work Ben!
Still building my Golden Me' am about 3/4 done.
I reckon with the spare and proto boards you sent me, I should have enough for another brains system and I plan to cut another bot to take my collection to 5 (3 working with brains at any one go).... (I was thinking Hardwood Boat Plywood...)

Congrats again on the success of the Kickstarter and being the 1st Notts area project to finish out of yourself, Wireless Things and Pimoroni...

Could you post a STL file?

The DXF file posted is intended (and tested) for laser cut acrylic components. It should be possible to import the profiles into a CAD system, extrude them to 3mm and create STL files, but there are few things to watch out for. I intend to have a go before too long, but I'm a bit busy at the moment. Anyone else fancy a go ?


I'm interested in building one and reading your reply, I wonder what are dos "few things to watch out for". Maybe I'll work on it this weekend.


Hi Luis - well my memory is not great, and it is a while since I looked at the 0.4 files but here are a few points...

1) The parts are sized for laser-cutting so the have a little extra material allowed for loss when cutting (called kerf I think ?) Not a problem if you are making a full set of parts, but might be an issue if you are trying to make a replacement part for a laser-cut robot.

2) The holes for 3mm screws did not come through as circles, but more like squares with rounded corners - that is a DXF transfer problem. Probably close enough for 3-D printing - but might need a bit of manual clean-up, and it just bugged me :-)

3) I seem to recall that the DXF file was "messy" in that there were loads of separate line segments rather than "polyline" profiles which caused a bit of hassle with open profiles. I manually fixed some of them, and tried some different CAD options to try to minimise the problems but I didn't end up with a solution I was totally happy about.

4) I was only using open source CAD/drawing packages (on Linux) - so it may be that commercial CAD packages can be a bit more forgiving with the input DXF file.

5) I worked with the 0.4 (and 0.3) dxf files, so the 1.0 file might be easier to work with. (Although a very quick test I did a few days back suggests that is still has the same "features" as the 0.4 DXF file. I was hoping it would just work - but it didn't for me.)

Maybe someone else with better tools and skills will be able to do it easily - please let us know what you find. It would be great to have someone else look into this.


Thank you so much for that detailed answer.

Will work on it this weekend. I only use open source tools (under Linux too), so it's seems to be a hard work hahaha.

I think I will made a github repository to hold the files and make it easy to everyone to help transforming it into a 3D printable design.

Thanks again.

That sounds like a good idea. I started by importing the original complete dxf file and exporting small sets of parts to make them smaller and easier to work with on my old laptop - if you do something like that maybe people could share the task.

Good luck

Yes it's a new version, there are many differences.

hi ! i can bring file .dxf cut, now? Have i need repair on .dxf ? and can you tell me this servo , what's it name ? I can servo MG996R ?
Thanks you !

Is this a new version? Whats different?