The Technic kit has 732 pieces. Lego may want to think about adding a ... and the differential moves as the wheels roll. The weird black gear on the roof actually connects to the front wheels ...

For instance, he built an elegant drawbot out of LEGO elements, seen above. At first glance the monicker “spirograph” seems wrong, because where are the gears? However, [Yoshihito] has them ...

I just got 3d printer kit and I need something to test it on. Gears are always useful... Requires gears library - https://github.com/chrisspen/gears which does the ...