I made this model to highlight how some components in mechanical devices, such as engines, work to turn rotational motion to linear motion and oscillatory motion, which is part of the study of kinematics.   The cam and crank are timed to move the corresponding shafts in opposite linear directions, thus making the “oscillator” move in an oscillatory motion.

Recommend using supports for the crank and cam.   

For the size of the model, I found an 0.25mm nozzle to produce the best results with a nozzle temperature of 205C for PLA (215C kept plugging the nozzle).  Scale it up if using a larger nozzle.

Remove any burrs that may cause interference during installation.

Simple to assemble.   Just follow the assembly instructions included in the images.