legs and joint for studying how a cock roach walks. functions of cock roach legs: front: steer and pull; middle: thrust and weight support; hind: thrust. this is a model for building my sma powered ride on roach (liquid as heat transfer media, lpg as heat source, 8 arduino (linked) as control unit, 10 ultra sound range finders as sensors, with other things like gyro, etc.

use a file to round the axles, and a 4.7mm drill to round the holes. make sure the the holes and axles have tight fit or the joints will move freely and the model won't remain in standing position.There are 3 bodies 3 sets of legs: front, mid, hind. print 2 each and connect with connecting beams (2 sets).