I got ten of these parts made by i.materialise using their default 420 stainless steel / bronze matrix material. Not only did I run into problems with the machinability of that material once I tried cutting it, but furthermore the geometry of this draft version of the part itself ended up needing improvements, and also my workholding plan was not good enough. I learned this right away when trying to make my first few cuts on one of these parts and got terrible surface finish quality whilst simultaneously destroying the endmill that I was using at the time.