Hi Alev,

How about designing, building and using a 3d printed stress/strain analysis system.

Using it to produce a systematic analysis of the relationships between the anisotropic strength and rigidity of printed parts based on:
Layer height
Extrusion temperature
Infill density
Wall thickness
Young's modulus, flexural modulus and yield strength of the material.

Load cells are reasonably easy to obtain, strain gauge amplifiers are easy to build, the stain can be induced and controlled at a constant rate using a lead screw driven by stepper motor (with a gearbox) running at constant number of steps per second, and the data can be collected using a simple AtoD converter and a PC.