Looks like Nylon12, it's at least SLS. Pretty resilient stuff and decent with temperature changes and quite inexpensive. We print a ton of stuff in that material.
"In general parts made of PA 12 show high mechanical strength and elasticity under steady stress in a temperature range from - 40°C till + 80°C. Short time loading of parts made of PA 12 without stress is possible up to 160°C "
Shapways labels it "Versatile Plastic".
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