So the version 4 printed circuit boards arrived a few days ago (no, that's not super-fast shipping from China, I just waited several weeks before even writing about them). I'm almost perfectly happy with them, so far I only came up with two small things I want to change. Probably not enough to make another version.

This time the board is bigger and the servo horns are not attached diagonally -- they fit within the board. The holes for the horns should be a little bit larger (depends on what servos you get, some of them fit perfectly) and not metalized, but that's something you can fix easily with a file. The board on the photo has all the parts soldered on one side of the board -- because I want to have the Pro Mini pluggable there. It's possible to also put the servo sockets and capacitor below, and have the top of the robot almost flat, then make use of all those mounting holes.

The finished robot is quite nice, and it's sturdier than the previous versions. Also much easier to assemble. I still need to fine-tune the leg positions on this one, and add the IR sensor.