We've build a couple of those robots at the Europython, thanks to everyone who worked on that! We also managed to come up with an improvement to the fragile knees this robot has. Instead of gluing those small rectangles of foamed pvc to the servo horns, simply melt the horn's plastic with a lighter and fuse them together. Makes them much stronger!
I was asked to re-make Micro:Bob for an upcoming conference (the original travels the world with the Micro:bit World Tour, and its exact location is at the moment unknown). Inspired by #TyroBot I decided to make a robot that has a more robot-ey shape -- looks like the ones in the old TV programs, or comic books.
The electronics and software didn't change so far (OK, I added LEDs for the eyes), it's mostly about the looks.
I also took photos as I went this time, so you can see the whole build process, and maybe have some insight in how I make the design decisions as I go.
First you need to find a box for the body. Those plastic blocks with pictures for children are pretty good -- they are 5x5x5cm, made out of pretty soft plastic which is easy to cut, and you can buy them in six-packs.
Of course you need to peel off and wash away the paper pictures from them (unless you don't mind your robot having them).
We need to mark the holes for the servos. I align them so that the hub of the servo is on the center line.
Then I cut it with a knife, a metal saw or a dremel tool.
Then drill the holes for screws.
We also need the holes for bolting on the Micro:bit.
Once I mark the holes, I drill them with a small drill bit.
And then I enlarge the holes with a screw or a dremel tool.