Aluminium in use is almost always an alloy, tailored for some characteristic (in fact the same can be said for every other industrial metal).
If you search eBay for Aluminium rod there's a good chance that what you'll find is 6082-T6, it's probably the most common machinable grade.
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ultiarjan 1,222
You can look up parts & UM design files on Github
https://github.com/Ultimaker/Ultimaker2/
the pdf for this part shows me the material is EN-AW-6082. Google tells me its alloy;
Alloy 6082 is known as a structural alloy. In plate form, 6082 is the alloy most commonly used for machining. As a relatively new alloy, the higher strength of 6082 has seen it replace 6061 in many applications. The addition of a large amount of manganese controls the grain structure which in turn results in a stronger alloy.
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