I am just about ready to begin my next robot project, when a silly little question popped up. As the title implies, I am finding it difficult to determine which building material to use for my robot chassis. Expanded Polyvinyl Chloride (Sintra) or High Density Polyethylene (HDPE). Through my research I was able to find that both materials seem to fit my needs; they are both thermoplastics, they can be easily remanufactured into the required dimensions, they are inexpensive, they both have similar tensile strength characteristics, ect. Within my research, I find that the two are both applicable to my project, and therefore I am unable to decide which material to use.
Based on your experience with either of the materials, which do you suggest?