Eh, both of you are right. Yes, a full-blown centrifuge could be made safer (put a shield around it, yadda-yadda). But if the paper device is made safe enough,

Eh, both of you are right. Yes, a full-blown centrifuge could be made safer (put a shield around it, yadda-yadda). But if the paper device is made safe enough, I don't see why it should not be used when there are no better options. And it appears that it could be made safe enough.